Patch 2026.09.2 (#50642)

* Move docs/ to root directory

* Fix file name

* Update scripts.md

* Delete playlist-structure.md

* Create playlists.md

* Update stream-testing.md

* Create geo-blocking.md

* Create stream-id.md

* Update CONTRIBUTING.md

docs/xtream-codes.md

@@ -0,0 +1,11 @@
+### Xtream Codes
+
+Most Xtream Codes stream links look like this:
+
+`http(s)://{hostname}:{port}/{username}/{password}/{channelID}` _(the port is often `25461`)_
+
+To make sure a link leads to an Xtream Codes server, copy the `hostname`, `port`, `username`, and `password` into the URL format below and try opening it in your browser:
+
+`http(s)://{hostname}:{port}/panel_api.php?username={username}&password={password}`
+
+If the page loads a response, it confirms you are dealing with an Xtream Codes server.