[v10.0.x] Docs: Backport of 69864 - Plugins reorganization (#71100)

* 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>
(cherry picked from commit f9df1f3051)

* Prettier fix

docs/sources/developers/plugins/migration-guide/v6.x-v7.x/_index.md

@@ -1,4 +1,6 @@
 ---
+title: Migrate plugins from Grafana version 6.x to 7.0
+menuTitle: v6.x to v7.x
 description: Guide for migrating plugins from Grafana v6.x to v7.x
 keywords:
   - grafana
@@ -6,8 +8,6 @@ keywords:
   - migration
   - plugin
   - documentation
-title: Migrate plugins from Grafana version 6.x to 7.x
-menutitle: v6.x to v7.x
 weight: 2500
 ---
 
@@ -23,7 +23,7 @@ Plugins built using Angular still work in the near term, but we strongly encoura
 
 ### New data format
 
-Along with the move to React, the new plugin platform introduced a new internal data format called [data frames](data-frames.md).
+Along with the move to React, the new plugin platform introduced a new internal data format called [data frames]({{< relref "../../introduction-to-plugin-development/data-frames" >}}).
 
 Previously, data source plugins could send data either as time series or tables. With data frames, data sources can send any data in a table-like structure. This gives you more flexibility to visualize your data in Grafana.
 
@@ -78,7 +78,7 @@ async query(options: DataQueryRequest<MyQuery>): Promise<DataQueryResponse> {
 
 ## Troubleshoot plugin migration
 
-As of Grafana 7.0, backend plugins can now be cryptographically signed to verify their origin. By default, Grafana ignores unsigned plugins. For more information, refer to [Allow unsigned plugins]({{< relref "../../../../administration/plugin-management/#allow-unsigned-plugins" >}}).
+As of Grafana 7.0, backend plugins can now be cryptographically signed to verify their origin. By default, Grafana ignores unsigned plugins. For more information, refer to [Allow unsigned plugins]({{< relref "../../../../administration/plugin-management#allow-unsigned-plugins" >}}).
 
 ## From version 6.5.x to 7.3.0