Merge pull request #10251 from nextcloud/backport/10064/stable3.7

[stable3.7] docs: Update app maintainers

.github/CODEOWNERS

@@ -1,2 +1,5 @@
 # App maintainers
-* @ChristophWurst
+* @ChristophWurst @gretad @kesselb
+
+/css @ChristophWurst @gretad
+/lib @ChristophWurst @kesselb

README.md

@@ -43,8 +43,9 @@ Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud
 
 ## Maintainers
 
-* [Christoph Wurst](https://github.com/ChristophWurst)
-* [Nextcloud Groupware team](https://github.com/nextcloud/groupware/#members)
+* [@ChristophWurst](https://github.com/ChristophWurst)
+* [@GretaD](https://github.com/GretaD)
+* [@kesselb](https://github.com/kesselb)
 
 ## Installation
 

appinfo/info.xml

@@ -31,8 +31,9 @@ Learn more about the Nextcloud Ethical AI Rating [in our blog](https://nextcloud
 	]]></description>
 	<version>3.7.8</version>
 	<licence>agpl</licence>
-	<author>Christoph Wurst</author>
-	<author homepage="https://github.com/nextcloud/groupware">Nextcloud Groupware Team</author>
+	<author homepage="https://github.com/ChristophWurst">Christoph Wurst</author>
+	<author homepage="https://github.com/GretaD">GretaD</author>
+	<author homepage="https://github.com/kesselb">kesselb</author>
 	<namespace>Mail</namespace>
 	<documentation>
 		<user>https://github.com/nextcloud/mail/blob/main/doc/user.md</user>