Docs: Add plugin overview (#24332)

* Docs: Add plugin overview

* Add plugin dev overview

* Fix review comments

* Fix review comments

docs/sources/plugins/_index.md

@@ -4,5 +4,44 @@ type = "docs"
 [menu.docs]
 name = "Plugins"
 identifier = "plugins"
-weight = 8
+weight = 1
 +++
+
+# Plugins
+
+Besides the wide range of visualizations and data sources that are available immediately after you install Grafana, you can extend your Grafana experience with _plugins_.
+
+You can [install]({{< relref "./installation.md" >}}) one of the plugins built by the Grafana community, or [build one yourself]({{< relref "./developing/development.md" >}}).
+
+Grafana supports three types of plugins: [panels](https://grafana.com/grafana/plugins?type=panel), [data sources](https://grafana.com/grafana/plugins?type=datasource), and [apps](https://grafana.com/grafana/plugins?type=app).
+
+## Panel plugins
+
+Add new visualizations to your dashboard with panel plugins, such as the [Worldmap Panel](https://grafana.com/grafana/plugins/grafana-worldmap-panel), [Clock](https://grafana.com/grafana/plugins/grafana-clock-panel), and [Pie Chart](https://grafana.com/grafana/plugins/grafana-piechart-panel).
+
+Use panel plugins when you want to:
+
+- Visualize data returned by data source queries.
+- Navigate between dashboards.
+- Control external systems, such as smart home devices.
+
+## Data source plugins
+
+Data source plugins add support for new databases, such as [Google BigQuery](https://grafana.com/grafana/plugins/doitintl-bigquery-datasource).
+
+Data source plugins communicate with external sources of data and return the data in a format that Grafana understands. By adding a data source plugin, you can immediately use the data in any of your existing dashboards.
+
+Use data source plugins when you want to import data from external systems.
+
+## App plugins
+
+Applications, or _app plugins_, bundle data sources and panels to provide a cohesive experience, such as the [Zabbix](https://grafana.com/grafana/plugins/alexanderzobnin-zabbix-app) and [Kubernetes](https://grafana.com/grafana/plugins/grafana-kubernetes-app) apps.
+
+Apps can also add custom pages for things like control panels.
+
+Use app plugins when you want to create an custom out-of-the-box monitoring experience.
+
+## Learn more
+
+- [Install plugins]({{< relref "./installation.md" >}})
+- Browse the available [Plugins](https://grafana.com/grafana/plugins)