[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, 49 deletions

diff --git a/docs/admin/engines/private-engines.rst b/docs/admin/engines/private-engines.rst
deleted file mode 100644
index cc6ab2565..000000000
--- a/docs/admin/engines/private-engines.rst
+++ /dev/null
@@ -1,49 +0,0 @@
-.. _private engines:
-
-============================
-Private Engines (``tokens``)
-============================
-
-Administrators might find themselves wanting to limit access to some of the
-enabled engines on their instances. It might be because they do not want to
-expose some private information through :ref:`offline engines`.  Or they would
-rather share engines only with their trusted friends or colleagues.
-
-To solve this issue the concept of *private engines* exists.
-
-
-A new option was added to engines named `tokens`. It expects a list of
-strings. If the user making a request presents one of the tokens of an engine,
-they can access information about the engine and make search requests.
-
-Example configuration to restrict access to the Arch Linux Wiki engine:
-
-.. code:: yaml
-
-  - name: arch linux wiki
-    engine: archlinux
-    shortcut: al
-    tokens: [ 'my-secret-token' ]
-
-
-Unless a user has configured the right token, the engine is going
-to be hidden from him/her. It is not going to be included in the
-list of engines on the Preferences page and in the output of
-`/config` REST API call.
-
-Tokens can be added to one's configuration on the Preferences page
-under "Engine tokens". The input expects a comma separated list of
-strings.
-
-The distribution of the tokens from the administrator to the users
-is not carved in stone. As providing access to such engines
-implies that the admin knows and trusts the user, we do not see
-necessary to come up with a strict process. Instead,
-we would like to add guidelines to the documentation of the feature.
-
-
-Acknowledgment
-==============
-
-This development was sponsored by `Search and Discovery Fund
-<https://nlnet.nl/discovery>`_ of `NLnet Foundation <https://nlnet.nl/>`_.