[mod] improve settings documentation

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

docs/admin/installation-searx.rst

@@ -70,13 +70,20 @@ from the login (*~/.profile*):
 Configuration
 =============
 
+.. sidebar:: ``use_default_settings: True``
+
+   - :ref:`settings global`
+   - :ref:`settings location`
+   - :ref:`settings use_default_settings`
+   - :origin:`/etc/searx/settings.yml <utils/templates/etc/searx/use_default_settings.yml>`
+
 To create a initial ``/etc/searx/settings.yml`` you can start with a copy of the
 file :origin:`utils/templates/etc/searx/use_default_settings.yml`.  This setup
-:option:ref:`use default settings <settings use_default_settings>` from
+:ref:`use default settings <settings use_default_settings>` from
 :origin:`searx/settings.yml` and is recommended since :pull:`2291` is merged.
 
-For minimal Setup, configure like shown below – replace ``searx@\$(uname -n)``
+For a *minimal setup*, configure like shown below – replace ``searx@$(uname
-with a name of your choice, set ``ultrasecretkey`` -- *and/or* edit
+-n)`` with a name of your choice, set ``ultrasecretkey`` -- *and/or* edit
 ``/etc/searx/settings.yml`` to your needs.
 
 .. kernel-include:: $DOCS_BUILD/includes/searx.rst

docs/admin/settings.rst

@@ -27,7 +27,8 @@ First, searx will try to load settings.yml from these locations:
 1. the full path specified in the ``SEARX_SETTINGS_PATH`` environment variable.
 2. ``/etc/searx/settings.yml``
 
-If these files don't exist (or are empty or can't be read), searx uses the :origin:`searx/settings.yml` file.
+If these files don't exist (or are empty or can't be read), searx uses the
+:origin:`searx/settings.yml` file.
 
 
 .. _settings global:
@@ -35,6 +36,9 @@ If these files don't exist (or are empty or can't be read), searx uses the :orig
 Global Settings
 ===============
 
+``general:``
+------------
+
 .. code:: yaml
 
    general:
@@ -54,7 +58,7 @@ Global Settings
   messages in the browser too, so this must be deactivated in production.
 
 ``contact_url``:
-  Contact mail address or WEB form.
+  Contact ``mailto:`` address or WEB form.
 
 ``git_url`` and ``git_branch``:
   Changes this, to point to your searx fork (branch).
@@ -69,6 +73,9 @@ Global Settings
   Link to your tweets (or ``False``)
 
 
+``server:``
+-----------
+
 .. code:: yaml
 
    server:
@@ -114,6 +121,8 @@ Global Settings
 ``default_http_headers``:
   Set additional HTTP headers, see `#755 <https://github.com/searx/searx/issues/715>`__
 
+``outgoing:``
+-------------
 
 .. code:: yaml
 
@@ -163,6 +172,10 @@ Global Settings
   If you use multiple network interfaces, define from which IP the requests must
   be made. This parameter is ignored when ``proxies`` is set.
 
+
+``locales:``
+------------
+
 .. code:: yaml
 
    locales:
@@ -268,26 +281,36 @@ Engine settings
 use_default_settings
 ====================
 
-.. note::
+.. sidebar:: ``use_default_settings: True``
 
-   If searx is cloned from a git repository, most probably there is no need to have an user settings.
+   - :ref:`settings location`
+   - :ref:`use_default_settings.yml`
+   - :origin:`/etc/searx/settings.yml <utils/templates/etc/searx/use_default_settings.yml>`
 
-The user defined settings.yml can relied on the default configuration :origin:`searx/settings.yml` using ``use_default_settings: True``.
+The user defined ``settings.yml`` is loaded from the :ref:`settings location`
+and can relied on the default configuration :origin:`searx/settings.yml` using:
 
-In the following example, the actual settings are the default settings defined in :origin:`searx/settings.yml` with the exception of the ``secret_key`` and the ``bind_address``:
+ ``use_default_settings: True``
 
-.. code-block:: yaml
+``server:``
+  In the following example, the actual settings are the default settings defined
+  in :origin:`searx/settings.yml` with the exception of the ``secret_key`` and
+  the ``bind_address``:
+
+  .. code-block:: yaml
 
     use_default_settings: True
     server:
         secret_key: "uvys6bRhKHUdFF5CqbJonSDSRN8H0sCBziNSrDGNVdpz7IeZhveVart3yvghoKHA"
         bind_address: "0.0.0.0"
 
-With ``use_default_settings: True``, each settings can be override in a similar way, the ``engines`` section is merged according to the engine ``name``.
+``engines:``
+  With ``use_default_settings: True``, each settings can be override in a
+  similar way, the ``engines`` section is merged according to the engine
+  ``name``.  In this example, searx will load all the engine and the arch linux
+  wiki engine has a :ref:`token<private engines>`:
 
-In this example, searx will load all the engine and the arch linux wiki engine has a :ref:`token<private engines>`:
+  .. code-block:: yaml
-
-.. code-block:: yaml
 
     use_default_settings: True
     server:
@@ -296,9 +319,12 @@ In this example, searx will load all the engine and the arch linux wiki engine h
       - name: arch linux wiki
         tokens: ['$ecretValue']
 
-It is possible to remove some engines from the default settings. The following example is similar to the above one, but searx doesn't load the the google engine:
+``engines:`` / ``remove:``
+  It is possible to remove some engines from the default settings. The following
+  example is similar to the above one, but searx doesn't load the the google
+  engine:
 
-.. code-block:: yaml
+  .. code-block:: yaml
 
     use_default_settings:
         engines:
@@ -310,9 +336,11 @@ It is possible to remove some engines from the default settings. The following e
       - name: arch linux wiki
         tokens: ['$ecretValue']
 
-As an alternative, it is possible to specify the engines to keep. In the following example, searx has only two engines:
+``engines:`` / ``keep_only:``
+  As an alternative, it is possible to specify the engines to keep. In the
+  following example, searx has only two engines:
 
-.. code-block:: yaml
+  .. code-block:: yaml
 
     use_default_settings:
         engines: