doc: use customized pocoo theme (pallets-sphinx-themes)

The old searx theme was a copy of the flask theme.  In the meantime this theme
is available from the python module pallets-sphinx-themes.

This patch makes pallets-sphinx-themes as a (dev) requirement and drops most of
the old and obsolete searx theme settings/files.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/_themes/searx/static/searx.css

+@import url("pocoo.css");
+
+a, a.reference, a.footnote-reference {
+  color: #004b6b;
+  border-color: #004b6b;
+}
+
+a:hover {
+  color: #6d4100;
+  border-color: #6d4100;
+}
+
+p.version-warning {
+  background-color: #004b6b;
+}

docs/_themes/searx/theme.conf

+[theme]
+inherit = pocoo
+stylesheet = searx.css
+
+[options]
+touch_icon =

docs/_themes/searx_theme/layout.html

-{%- extends "basic/layout.html" %}
-{%- block extrahead %}
-  {{ super() }}
-  {% if theme_touch_icon %}
-    <link rel="apple-touch-icon" href="{{ pathto('_static/' ~ theme_touch_icon, 1) }}" />
-  {% endif %}
-  <link media="only screen and (max-device-width: 480px)" href="{{
-    pathto('_static/small_flask.css', 1) }}" type= "text/css" rel="stylesheet" />
-  <meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9">
-{% endblock %}
-{%- block relbar2 %}{% endblock %}
-{%- block relbar1 %}{% endblock %}
-{%- block sidebarsearch %}{% endblock %}
-{%- block sidebarsourcelink %}{% endblock %}
-{%- block sidebartoc %}{% endblock %}
-{%- block footer %}
-    <div class="footer">
-      &copy; Copyright {{ copyright }}.
-    </div>
-{%- endblock %}

docs/_themes/searx_theme/relations.html

-<div class="sidebar_container body">
-<h1>Searx</h1>
-<ul>
-    <li><a href="{{ pathto('index') }}">Home</a></li>
-    <li><a href="https://github.com/asciimoo/searx">Source</a></li>
-    <li><a href="{{ pathto('blog/blog') }}">Blog</a></li>
-    <li><a href="https://github.com/asciimoo/searx/wiki">Wiki</a></li>
-    <li><a href="https://github.com/asciimoo/searx/wiki/Searx-instances">Public instances</a></li>
-</ul>
-<hr />
-<ul>
-    <li><a href="https://twitter.com/Searx_engine">Twitter</a></li>
-</ul>
-</div>

docs/_themes/searx_theme/static/style.css_t

-/*
- * flasky.css_t
- * ~~~~~~~~~~~~
- *
- * :copyright: Copyright 2010 by Armin Ronacher. Modifications by Kenneth Reitz.
- * :license: Flask Design License, see LICENSE for details.
- */
-
-{% set page_width = '940px' %}
-{% set sidebar_width = '220px' %}
-
-@import url("basic.css");
-
-/* -- page layout ----------------------------------------------------------- */
-
-body {
-    font-family: 'goudy old style', 'minion pro', 'bell mt', Georgia, 'Hiragino Mincho Pro';
-    font-size: 17px;
-    background-color: white;
-    color: #000;
-    margin: 0;
-    padding: 0;
-}
-
-div.document {
-    width: {{ page_width }};
-    margin: 30px auto 0 auto;
-}
-
-div.documentwrapper {
-    float: left;
-    width: 100%;
-}
-
-div.bodywrapper {
-    margin: 0 0 0 {{ sidebar_width }};
-}
-
-div.sphinxsidebar {
-    width: {{ sidebar_width }};
-    word-wrap: normal !important;
-    overflow-wrap: normal !important;
-}
-
-hr {
-    border: 1px solid #B1B4B6;
-}
-
-div.body {
-    background-color: #ffffff;
-    color: #3E4349;
-    padding: 0 30px 0 30px;
-}
-
-img.floatingflask {
-    padding: 0 0 10px 10px;
-    float: right;
-}
-
-div.footer {
-    width: {{ page_width }};
-    margin: 20px auto 30px auto;
-    font-size: 14px;
-    color: #888;
-    text-align: right;
-}
-
-div.footer a {
-    color: #888;
-}
-
-div.sphinxsidebar a {
-    color: #444;
-    text-decoration: none;
-    border-bottom: 1px dotted #999;
-}
-
-div.sphinxsidebar a:hover {
-    border-bottom: 1px solid #999;
-}
-
-div.sphinxsidebarwrapper {
-    padding: 0 10px;
-}
-
-div.sphinxsidebarwrapper p.logo {
-    padding: 0;
-    margin: -10px 0 0 -20px;
-    text-align: center;
-}
-
-div.sphinxsidebar h3,
-div.sphinxsidebar h4 {
-    font-family: 'Garamond', 'Georgia', serif;
-    color: #444;
-    font-size: 24px;
-    font-weight: normal;
-    margin: 0 0 5px 0;
-    padding: 0;
-}
-
-div.sphinxsidebar h4 {
-    font-size: 20px;
-}
-
-div.sphinxsidebar h3 a {
-    color: #444;
-}
-
-div.sphinxsidebar p.logo a,
-div.sphinxsidebar h3 a,
-div.sphinxsidebar p.logo a:hover,
-div.sphinxsidebar h3 a:hover {
-    border: none;
-}
-
-div.sphinxsidebar p {
-    color: #555;
-    margin: 10px 0;
-}
-
-div.sphinxsidebar ul {
-    margin: 10px 0;
-    padding: 0;
-    color: #000;
-}
-
-div.sphinxsidebar input {
-    border: 1px solid #ccc;
-    font-family: 'Georgia', serif;
-    font-size: 1em;
-}
-
-/* -- body styles ----------------------------------------------------------- */
-
-a {
-    color: #004B6B;
-    text-decoration: underline;
-}
-
-a:hover {
-    color: #6D4100;
-    text-decoration: underline;
-}
-
-div.body h1,
-div.body h2,
-div.body h3,
-div.body h4,
-div.body h5,
-div.body h6 {
-    font-family: 'Garamond', 'Georgia', serif;
-    font-weight: normal;
-    margin: 30px 0px 10px 0px;
-    padding: 0;
-}
-
-div.body h1 { margin-top: 0; padding-top: 0; font-size: 240%; }
-div.body h2 { font-size: 180%; }
-div.body h3 { font-size: 150%; }
-div.body h4 { font-size: 130%; }
-div.body h5 { font-size: 100%; }
-div.body h6 { font-size: 100%; }
-
-a.headerlink {
-    color: #ddd;
-    padding: 0 4px;
-    text-decoration: none;
-}
-
-a.headerlink:hover {
-    color: #444;
-    background: #eaeaea;
-}
-
-div.body p, div.body dd, div.body li {
-    line-height: 1.4em;
-}
-
-div.admonition {
-    background: #fafafa;
-    margin: 20px -30px;
-    padding: 10px 30px;
-    border-top: 1px solid #ccc;
-    border-bottom: 1px solid #ccc;
-}
-
-div.admonition tt.xref, div.admonition a tt {
-    border-bottom: 1px solid #fafafa;
-}
-
-dd div.admonition {
-    margin-left: -60px;
-    padding-left: 60px;
-}
-
-div.admonition p.admonition-title {
-    font-family: 'Garamond', 'Georgia', serif;
-    font-weight: normal;
-    font-size: 24px;
-    margin: 0 0 10px 0;
-    padding: 0;
-    line-height: 1;
-}
-
-div.admonition p.last {
-    margin-bottom: 0;
-}
-
-div.highlight {
-    background-color: white;
-}
-
-dt:target, .highlight {
-    background: #FAF3E8;
-}
-
-div.note {
-    background-color: #eee;
-    border: 1px solid #ccc;
-}
-
-div.seealso {
-    background-color: #ffc;
-    border: 1px solid #ff6;
-}
-
-div.topic {
-    background-color: #eee;
-}
-
-p.admonition-title {
-    display: inline;
-}
-
-p.admonition-title:after {
-    content: ":";
-}
-
-pre, tt {
-    font-family: 'Consolas', 'Menlo', 'Deja Vu Sans Mono', 'Bitstream Vera Sans Mono', monospace;
-    font-size: 0.9em;
-}
-
-img.screenshot {
-}
-
-tt.descname, tt.descclassname {
-    font-size: 0.95em;
-}
-
-tt.descname {
-    padding-right: 0.08em;
-}
-
-img.screenshot {
-    -moz-box-shadow: 2px 2px 4px #eee;
-    -webkit-box-shadow: 2px 2px 4px #eee;
-    box-shadow: 2px 2px 4px #eee;
-}
-
-table.docutils {
-    border: 1px solid #888;
-    -moz-box-shadow: 2px 2px 4px #eee;
-    -webkit-box-shadow: 2px 2px 4px #eee;
-    box-shadow: 2px 2px 4px #eee;
-}
-
-table.docutils td, table.docutils th {
-    border: 1px solid #888;
-    padding: 0.25em 0.7em;
-}
-
-table.field-list, table.footnote {
-    border: none;
-    -moz-box-shadow: none;
-    -webkit-box-shadow: none;
-    box-shadow: none;
-}
-
-table.footnote {
-    margin: 15px 0;
-    width: 100%;
-    border: 1px solid #eee;
-    background: #fdfdfd;
-    font-size: 0.9em;
-}
-
-table.footnote + table.footnote {
-    margin-top: -15px;
-    border-top: none;
-}
-
-table.field-list th {
-    padding: 0 0.8em 0 0;
-}
-
-table.field-list td {
-    padding: 0;
-}
-
-table.footnote td.label {
-    width: 0px;
-    padding: 0.3em 0 0.3em 0.5em;
-}
-
-table.footnote td {
-    padding: 0.3em 0.5em;
-}
-
-dl {
-    margin: 0;
-    padding: 0;
-}
-
-dl dd {
-    margin-left: 30px;
-}
-
-blockquote {
-    margin: 0 0 0 30px;
-    padding: 0;
-}
-
-ul, ol {
-    margin: 10px 0 10px 30px;
-    padding: 0;
-}
-
-pre {
-    background: #eee;
-    padding: 7px 30px;
-    margin: 15px -30px;
-    line-height: 1.3em;
-}
-
-dl pre, blockquote pre, li pre {
-    margin-left: -60px;
-    padding-left: 60px;
-}
-
-dl dl pre {
-    margin-left: -90px;
-    padding-left: 90px;
-}
-
-tt {
-    background-color: #ecf0f3;
-    color: #222;
-    /* padding: 1px 2px; */
-}
-
-tt.xref, a tt {
-    background-color: #FBFBFB;
-    border-bottom: 1px solid white;
-}
-
-a.reference {
-    text-decoration: none;
-    border-bottom: 1px dotted #004B6B;
-}
-
-a.reference:hover {
-    border-bottom: 1px solid #6D4100;
-}
-
-a.footnote-reference {
-    text-decoration: none;
-    font-size: 0.7em;
-    vertical-align: top;
-    border-bottom: 1px dotted #004B6B;
-}
-
-a.footnote-reference:hover {
-    border-bottom: 1px solid #6D4100;
-}
-
-a:hover tt {
-    background: #EEE;
-}
-
-
-@media screen and (max-width: 600px) {
-
-    div.document {
-       width: 100%;
-
-    }
-
-    div.documentwrapper {
-    	margin-left: 0;
-    	margin-top: 0;
-    	margin-right: 0;
-    	margin-bottom: 0;
-    }
-
-    div.bodywrapper {
-    	margin-top: 0;
-    	margin-right: 0;
-    	margin-bottom: 0;
-    	margin-left: 0;
-    }
-
-    ul {
-    	margin-left: 0;
-    }
-
-    .document {
-    	width: auto;
-    }
-
-    .footer {
-    	width: auto;
-    }
-
-    .bodywrapper {
-    	margin: 0;
-    }
-
-    .footer {
-    	width: auto;
-    }
-
-    div.sphinxsidebar {
-        display: none;
-    }
-
-}
-
-div.sidebar_container, div.sidebar_container h1 {
-}
-
-div.sidebar_container h1 {
-    padding: 0;
-    margin: 0;
-    font-size: 350%;
-    line-height: 100%;
-}
-
-div.sidebar_container ul li {
-    padding: 2px 8px;
-    font-size: 0.9em;
-}

docs/_themes/searx_theme/theme.conf

-[theme]
-inherit = basic
-stylesheet = style.css
-pygments_style = flask_theme_support.FlaskyStyle
-
-[options]
-touch_icon = 

docs/index.rst

@@ -41,6 +41,7 @@ Administrator documentation
    admin/api
    admin/filtron
    admin/morty
+   blog/blog
 
 Developer documentation
 -----------------------

requirements-dev.txt

+pallets-sphinx-themes
+Sphinx
+sphinx-issues
 mock==2.0.0
 nose2[coverage_plugin]
 cov-core==1.15.0