docs: proofreading of all the installation topics

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

docs/utils/morty.sh.rst

@@ -11,8 +11,9 @@
 
 .. sidebar:: further reading
 
-   - :ref:`installation`
    - :ref:`architecture`
+   - :ref:`installation` (:ref:`nginx <installation nginx>` & :ref:`apache
+     <installation apache>`)
    - :ref:`searx morty`
 
 To simplify installation and maintenance of a morty_ instance you can use the
@@ -67,6 +68,8 @@ Install morty software and systemd unit:
    :start-after: START install systemd unit
    :end-before: END install systemd unit
 
+.. _morty.sh overview:
+
 Overview
 ========