Update plugin tuto for v11

[trasher]

@cconard96 already made some remarks on v10 PR:

• Search list https://github.com/glpi-project/docdev/pull/166/files#r1941425366
• Use debug bar https://github.com/glpi-project/docdev/pull/166/files#r1941436500

There are certainly several other things to change.

• New routing system