[DOCS] Streamline installation chapters of system extension manuals, part 2

Updated and renamed files and adapted paths and extension names.

Resolves: #103497
Releases: main, 12.4
Change-Id: Ib79540d47a9112711d53373de2952203c41ded9a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83618


Reviewed-by: Chris Müller <typo3@krue.ml>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Lina Wolf <112@linawolf.de>
Tested-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Lina Wolf <112@linawolf.de>

typo3/sysext/dashboard/Documentation/Installation/Index.rst

@@ -44,8 +44,8 @@ Installation without Composer
 In an installation without Composer, the extension is already shipped. You just have to activate it.
 Head over to the extension manager and activate the extension.
 
-.. figure:: /Images/em.png
+.. figure:: /Images/InstallActivate.png
    :class: with-shadow
-   :alt: Extension manager with filtered dashboard extension
+   :alt: Extension manager showing Dashboard extension
 
-   Extension manager with filtered dashboard extension
+   Extension manager showing Dashboard extension

typo3/sysext/seo/Documentation/Installation/Index.rst

@@ -47,7 +47,7 @@ not be activated yet. Activate it as follows:
     module.
 #.  Click the :guilabel:`Activate` icon for the SEO extension.
 
-..  figure:: /Images/em.png
+..  figure:: /Images/InstallActivate.png
     :class: with-border
     :alt: Extension manager showing SEO extension
 

typo3/sysext/sys_note/Documentation/Installation/Index.rst

@@ -41,8 +41,8 @@ In an installation without Composer, the code of EXT:sys_note is already shipped
 You just have to activate the extension. Head over to the
 :guilabel:`Admin Tools > Extensions` module and activate the extension.
 
-..  figure:: ../Images/em.png
-    :alt: Extension Manager with sys_note extension
+..  figure:: /Images/InstallActivate.png
+    :alt: Extension Manager showing System Notes extension
     :class: with-shadow
 
-    Extension manager with :sql:`sys_note` extension
+    Extension manager showing System Notes extension