This reverts commit ff00345c

This commit splits the policy checks we do on node operations into
"read" checks and "write" checks, so that we can enforce different kind
of policies based on the state of a node (i.e. published or not).

This commit refactors a bit the internal of the
`Gargantext.Database.Query.Tree` module so that it removes a lot of
repetitive boilerplate and paves the way to more interesting features.

It also:

* Adds the `isUserNode` boolean query
* Adjust source and target in publishNode and unpublishNode
* Pass the currently-logged-in user to tree API functions

It also:

* Amends tests for policy checks status code changes
* Fix a bug in isNodeReadOnly
* Adds a function to return all the nodes ids for the published
  nodes. Next we need to modify `findShared` & co to make sure that
  published notes will show somewhere in the users' tree.

I moved HasConfig to Core/Config instead of it being in Database.Prelude

- Re-enable orphan warnings that were manually disabled in many modules
- Remove non-Haskell files that were just sitting in the source tree
- Remove modules that were not called from anywhere
- Remove unused dependencies

This is not exhaustive by any means. In particular, some more weeding out
can be achieved by looking at individual functions and even branches of
functions. Weeder can help with that.

Also, fixed breadcrumbs to accept AppRoute.

This reverts commit f4284b4e.

This reverts commit efbe327f, reversing
changes made to 6d9bcd07.

We have contexts.hash_id which is enough (computed by postgres as a
trigger).

This commit fixes those GQL types which were defined as an empty
record, as this was rejected in the latest versions of
`morpheus-graphql`.

This allows us to have only one single (static) map which will be
treated by GHC as a CAF.

This commit introduces a new DB function called `isSharedWith`
that can be used to check for team/public/private nodes and their
shared resources.

This is a first stepping stone in avoiding bugs by having `UserId` and
`ContextId` being proper types, and not synonyms.

We also refactor things to have `AuthenticatedUser` carry the `UserId`.

Basically, Gargantext.Prelude exports all of Protolude now.