Docs: Plugins doc reorganization, part 1 (#69864)

* Initial commit

* Prettier fixes

* Doc-validator fixes part 1

* Doc-validator fixes part 2

* More doc-validator fixes

* More doc-validator fixes

* Test

* link test

* Linnk test

* Link test

* More fixes

* More fixes

* Doc-validator fixes

* Doc-validator fixes

* fix broken link

* Fix

* Testing

* Doc fixes

* Link fixes

* Fix links

* Update docs/sources/developers/plugins/create-a-grafana-plugin/_index.md

Co-authored-by: David Harris <david.harris@grafana.com>

* Testing

* Testing

* Testing

* Testing

* Doc-validator fixes

* Doc-validator fixes

* Doc-validator fixes

* Fix broken links for plugins reorganization project

* Prettier fixes

* Prettier fixes

* Incorporate reviewer feedback

* Link fixes

* Link fixes

* Link fixes

* Link fix

* Deleted space

* Codeowners fix

* Change grafana.com links to absolute URLs for Hugo

---------

Co-authored-by: David Harris <david.harris@grafana.com>

docs/sources/developers/plugins/plugin.schema.json

@@ -329,10 +329,10 @@
     },
     "routes": {
       "type": "array",
-      "description": "For data source plugins. Proxy routes used for plugin authentication and adding headers to HTTP requests made by the plugin. For more information, refer to [Authentication for data source plugins](https://grafana.com/docs/grafana/latest/developers/plugins/authentication/).",
+      "description": "For data source plugins. Proxy routes used for plugin authentication and adding headers to HTTP requests made by the plugin. For more information, refer to [Authentication for data source plugins](/docs/grafana/latest/developers/plugins/authentication/).",
       "items": {
         "type": "object",
-        "description": "For data source plugins. Proxy routes used for plugin authentication and adding headers to HTTP requests made by the plugin. For more information, refer to [Authentication for data source plugins](https://grafana.com/docs/grafana/latest/developers/plugins/authentication/).",
+        "description": "For data source plugins. Proxy routes used for plugin authentication and adding headers to HTTP requests made by the plugin. For more information, refer to [Authentication for data source plugins](/docs/grafana/latest/developers/plugins/authentication/).",
         "additionalProperties": false,
         "properties": {
           "path": {