Merge remote-tracking branch 'origin/main' into 5.0

# Conflicts:
#	migrations/40-41/combat-plugin.md

Author: HLeithner

docs/building-extensions/installation/index.md renamed to docs/building-extensions/plugins/installation/index.md

@@ -1,5 +1,5 @@
-Plugins
-=======
+Installation
+============
 Plugins are in Plugin Groups and listen to different events.
 :::caution TODO
 

docs/building-extensions/installation/install-script.md renamed to docs/building-extensions/plugins/installation/install-script.md

@@ -0,0 +1,9 @@
+---
+sidebar_position: 1000
+---
+
+Changes to the CMS and the API
+==============================
+
+The deprecations and code changes are version independent and can be found in the
+[migration](/migrations) sections in this documentation.