[TASK] Activate all required extensions (#358)

* [TASK] Activate all required extensions

This change modifies the `QuickStart: Set up TYPO3`
section to activate the mandantory system extension
`indexed_search` along with `styleguide` to reflect latest
dependency chain.

All other dependant extensions are already pre-enabled
via 'typo3 extension:setup'.

---------

Co-authored-by: Garvin Hicking <[email protected]>

Author: sbuerk

Documentation/Quickstart/5-TYPO3.rst

@@ -64,9 +64,10 @@ Quick Start: Set up TYPO3
 3.  Activate `EXT:styleguide`
 
     ..  code:: bash
-        :caption: **Ensure extension setup and activate EXT:styleguide**
+        :caption: **Ensure extension setup and activate required extensions (EXT:styleguide, EXT:indexed_search)**
 
         ddev typo3 extension:setup && \
+            ddev typo3 extension:activate indexed_search && \
             ddev typo3 extension:activate styleguide
 
     ..  code:: bash