Add new eTools.ch engine

Fix default locale and language issues

docs: fix dead Searx-instance links to https://searx.space

Related to #1853 / BTW update year of copyright note
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

[mod] move public instance list to https://searx.space

Fix regional settings #844 

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

[fix] Disable HTTP keep alive

Thanks! .. excellent work, I see you on #1836 :)

This PR adds a new setting to engines named `tokens`.
It expects a list of tokens which lets searx validate
if the request should be accepted or not.

Fix HTTP 429 response from filtron
See https://github.com/searx/searx-docker/issues/24

Fix deprecated werkzeug import

Close: #1830
Signed-off-by: Nicolas Gelot <nicolas.gelot@e.email>

[mod] infinite scroll: XHR requests are sent with the header "Accept: text/html"

searx.be stopped using Fathom analytics

[engines|fix] flickr_noapi: Fix double-encode error (fixes #1799)

misc docs

fix project link in conf.py
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

fixed some reST markups
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Oscar: move info box at top of the page

fixes: https://github.com/asciimoo/searx/issues/1770

This is not Searx at all. This is Meta-Searx with other engines.

See https://github.com/asciimoo/searx/issues/1770#issuecomment-570776655Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Move wiki entry https://github.com/asciimoo/searx/wiki/Searx-instances
into user section of the docs (#1785).

links has been ported from markdown to reST by::

      regexpr:        \[([^\]]*)\]\(([^)]*)\)
      substitution:  `\1 <\2>`__
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Move wiki entry https://github.com/asciimoo/searx/wiki/Searx-instances
into user section of the docs (#1785).
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>