Document scss support drop

Signed-off-by: John Molakvoæ <skjnldsv@users.noreply.github.com>

Author: skjnldsv

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_25.rst

@@ -17,6 +17,13 @@ Make sure your ``appinfo/info.xml`` allows for Nextcloud 25.
 	<dependencies>
 	  <nextcloud min-version="22" max-version="25" />
 	</dependencies>
+	
+SCSS support removal
+^^^^^^^^^^^^^^^^^^^^
+
+With 25, we removed the support for scss files provided by apps.
+Please handle your own compilation, move to a vue app or move back to css.
+See https://github.com/nextcloud/server/issues/32060
 
 Front-end changes
 -----------------
@@ -36,4 +43,4 @@ tbd
 Removed APIs
 ^^^^^^^^^^^^
 
-tbd
+- Removed SVG colour api