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/create-a-grafana-plugin/develop-a-plugin/_index.md

@@ -0,0 +1,28 @@
+---
+title: Develop a Grafana plugin
+menuTitle: Develop a plugin
+keywords:
+  - grafana
+  - plugins
+  - plugin
+  - development
+  - documentation
+description: An index of how-to topics for Grafana plugin development.
+weight: 100
+---
+
+# Develop a Grafana plugin
+
+This section contains how-to topics for developing Grafana plugins:
+
+- [Build a panel plugin]({{< relref "./build-a-panel-plugin.md" >}})
+- [Build a panel plugin with d3.js]({{< relref "./build-a-panel-plugin-with-d3.md" >}})
+- [Build a data source plugin]({{< relref "./build-a-data-source-plugin.md" >}})
+- [Build a data source backend plugin]({{< relref "./build-a-data-source-backend-plugin.md" >}})
+- [Build a logs data source plugin]({{< relref "./build-a-logs-data-source-plugin.md" >}})
+- [Build a streaming data source plugin]({{< relref "./build-a-streaming-data-source-plugin.md" >}})
+- [Work with data frames]({{< relref "./working-with-data-frames.md" >}})
+
+Additional resources:
+
+- [Build a Grafana plugin with the create-plugin tool](https://grafana.github.io/plugin-tools/docs/creating-a-plugin)