docs: revision of the installation instructions

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

docs/user/index.rst

@@ -3,7 +3,8 @@ User documentation
 ==================
 
 .. toctree::
-   :maxdepth: 1
+   :maxdepth: 2
+   :caption: Contents
 
    public_instances
    search_syntax

docs/user/own-instance.rst

@@ -2,8 +2,10 @@
 Why use a private instance?
 ===========================
 
-"Is it worth to run my own instance?" is a common question among searx users.
-Before answering this question, see what options a searx user has.
+  *"Is it worth to run my own instance?"*
+
+\.\. is a common question among searx users.  Before answering this question,
+see what options a searx user has.
 
 Public instances are open to everyone who has access to its URL.  Usually, these
 are operated by unknown parties (from the users' point of view).  Private

docs/user/public_instances.rst

@@ -1,16 +1,20 @@
-.. _public instances:
-
 ..
    links has been ported from markdown to reST by::
 
       regexpr:        \[([^\]]*)\]\(([^)]*)\)
       substitution:  `\1 <\2>`__
 
+.. _public instances:
 
 ======================
 Public Searx instances
 ======================
 
+.. contents:: Contents
+   :depth: 2
+   :local:
+   :backlinks: entry
+
 .. _mailing list: mailto:searx-instances@autistici.org
 .. _subscription page: https://www.autistici.org/mailman/listinfo/searx-instances