[TASK]: Moved extensions to seperat file (#515)

* [TASK]: Moved extensions to seperat file

* [TASK]: Fixed link and header

---------

Co-authored-by: Kiebele <[email protected]>

Author: mkiebele

Documentation/Concepts/Extensions/Index.rst

@@ -0,0 +1,15 @@
+:navigation-title: Extensions
+..  include:: /Includes.rst.txt
+
+..  _concepts-extensions:
+
+==========
+Extensions
+==========
+
+.. figure:: /Images/Illustrations/extensions.png
+
+Extensions are pieces of software developed by the TYPO3 community that extend
+the functionality of a TYPO3 installation. Extensions come in many forms
+- from small extensions that carry out specific tasks to larger extensions that
+provide an entire suite of functionality, e.g. the TYPO3 Blog Extension.

Documentation/Concepts/Index.rst

@@ -48,6 +48,14 @@ TYPO3 Concepts
         ..  card-footer:: :ref:`Webroot and assets - where to put public files <webroot>`
             :button-style: btn btn-secondary stretched-link
 
+    ..  card:: Extensions
+
+        An extension in TYPO3 is an add-on module that enhances the core
+        functionality of the CMS, allowing you to add custom features or
+        tools to your website.
+
+        ..  card-footer:: :ref:`Extensions <concepts-extensions>`
+            :button-style: btn btn-secondary stretched-link
 
 ..  toctree::
     :caption: Topics
@@ -61,20 +69,13 @@ TYPO3 Concepts
     Assets/Index
     Backend/Index
     Frontend/Index
+    Extensions/Index
     */Index
     *
 
 
 
 
 
-Extensions
-----------
-
-.. figure:: /Images/Illustrations/extensions.png
 
-Extensions are pieces of software developed by the TYPO3 community that extend
-the functionality of a TYPO3 installation. Extensions come in many forms
-- from small extensions that carry out specific tasks to larger extensions that
-provide an entire suite of functionality, e.g. the TYPO3 Blog Extension.