[doc] rearranges Settings & Engines docs for better readability

We have built up detailed documentation of the *settings* and the *engines* over
the past few years.  However, this documentation was still spread over various
chapters and was difficult to navigate in its entirety.

This patch rearranges the Settings & Engines documentation for better
readability.

To review new ordered docs::

   make docs.clean docs.live

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

1 files changed, 0 insertions, 135 deletions

diff --git a/docs/admin/engines/nosql-engines.rst b/docs/admin/engines/nosql-engines.rst
deleted file mode 100644
index 93f1dd58e..000000000
--- a/docs/admin/engines/nosql-engines.rst
+++ /dev/null
@@ -1,135 +0,0 @@
-===============
-NoSQL databases
-===============
-
-.. sidebar:: further read
-
-   - `NoSQL databases <https://en.wikipedia.org/wiki/NoSQL>`_
-   - `redis.io <https://redis.io/>`_
-   - `MongoDB <https://www.mongodb.com>`_
-
-The following `NoSQL databases`_ are supported:
-
-- :ref:`engine redis_server`
-- :ref:`engine mongodb`
-
-All of the engines above are just commented out in the :origin:`settings.yml
-<searx/settings.yml>`, as you have to set various options and install
-dependencies before using them.
-
-By default, the engines use the ``key-value`` template for displaying results /
-see :origin:`simple <searx/templates/simple/result_templates/key-value.html>`
-theme.  If you are not satisfied with the original result layout, you can use
-your own template, set ``result_template`` attribute to ``{template_name}`` and
-place the templates at::
-
-  searx/templates/{theme_name}/result_templates/{template_name}
-
-Furthermore, if you do not wish to expose these engines on a public instance, you
-can still add them and limit the access by setting ``tokens`` as described in
-section :ref:`private engines`.
-
-
-Configure the engines
-=====================
-
-`NoSQL databases`_ are used for storing arbitrary data without first defining
-their structure.
-
-
-Extra Dependencies
-------------------
-
-For using :ref:`engine redis_server` or :ref:`engine mongodb` you need to
-install additional packages in Python's Virtual Environment of your SearXNG
-instance.  To switch into the environment (:ref:`searxng-src`) you can use
-:ref:`searxng.sh`::
-
-  $ sudo utils/searxng.sh instance cmd bash
-  (searxng-pyenv)$ pip install ...
-
-
-.. _engine redis_server:
-
-Redis Server
-------------
-
-.. _redis: https://github.com/andymccurdy/redis-py#installation
-
-.. sidebar:: info
-
-   - ``pip install`` redis_
-   - redis.io_
-   - :origin:`redis_server.py <searx/engines/redis_server.py>`
-
-
-Redis is an open source (BSD licensed), in-memory data structure (key value
-based) store.  Before configuring the ``redis_server`` engine, you must install
-the dependency redis_.
-
-Select a database to search in and set its index in the option ``db``.  You can
-either look for exact matches or use partial keywords to find what you are
-looking for by configuring ``exact_match_only``.  You find an example
-configuration below:
-
-.. code:: yaml
-
-  # Required dependency: redis
-
-  - name: myredis
-    shortcut : rds
-    engine: redis_server
-    exact_match_only: false
-    host: '127.0.0.1'
-    port: 6379
-    enable_http: true
-    password: ''
-    db: 0
-
-.. _engine mongodb:
-
-MongoDB
--------
-
-.. _pymongo: https://github.com/mongodb/mongo-python-driver#installation
-
-.. sidebar:: info
-
-   - ``pip install`` pymongo_
-   - MongoDB_
-   - :origin:`mongodb.py <searx/engines/mongodb.py>`
-
-MongoDB_ is a document based database program that handles JSON like data.
-Before configuring the ``mongodb`` engine, you must install the dependency
-redis_.
-
-In order to query MongoDB_, you have to select a ``database`` and a
-``collection``.  Furthermore, you have to select a ``key`` that is going to be
-searched.  MongoDB_ also supports the option ``exact_match_only``, so configure
-it as you wish.  Below is an example configuration for using a MongoDB
-collection:
-
-.. code:: yaml
-
-  # MongoDB engine
-  # Required dependency: pymongo
-
-  - name: mymongo
-    engine: mongodb
-    shortcut: md
-    exact_match_only: false
-    host: '127.0.0.1'
-    port: 27017
-    enable_http: true
-    results_per_page: 20
-    database: 'business'
-    collection: 'reviews'  # name of the db collection
-    key: 'name'            # key in the collection to search for
-
-
-Acknowledgment
-==============
-
-This development was sponsored by `Search and Discovery Fund
-<https://nlnet.nl/discovery>`_ of `NLnet Foundation <https://nlnet.nl/>`_.
-