Restructure plugin docs (#24381)

docs/sources/developers/plugins/_index.md

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++++
+title = "Build a plugin"
+type = "docs"
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+
+# Build a plugin
+
+For more information on the types of plugins you can build, refer to the [Plugin Overview]({{< relref "../../plugins/_index.md" >}}).
+
+## Get started
+
+The easiest way to start developing Grafana plugins is to use the [Grafana Toolkit](https://www.npmjs.com/package/@grafana/toolkit).
+
+Open the terminal, and run the following command in your [plugin directory]({{< relref "../../installation/configuration/_index.md#plugins" >}}):
+
+```bash
+npx @grafana/toolkit plugin:create my-grafana-plugin
+```
+
+If you want a more guided introduction to plugin development, check out our tutorials:
+
+- [Build a panel plugin]({{< relref "../../../../../tutorials/build-a-panel-plugin.md" >}})
+- [Build a data source plugin]({{< relref "../../../../../tutorials/build-a-data-source-plugin.md" >}})
+
+## Go further
+
+Learn more about specific areas of plugin development.
+
+### Concepts
+
+Deepen your knowledge through a series of high-level overviews of plugin concepts.
+
+- [Data frames]({{< relref "data-frames.md" >}})
+- [Authentication for data source plugins]({{< relref "authentication.md" >}})
+
+### UI library
+
+Explore the many UI components in our [Grafana UI library](https://developers.grafana.com/ui).
+
+### Tutorials
+
+If you're looking to build your first plugin, check out these introductory tutorials:
+
+- [Build a panel plugin]({{< relref "../../../../../tutorials/build-a-panel-plugin.md" >}})
+- [Build a data source plugin]({{< relref "../../../../../tutorials/build-a-data-source-plugin.md" >}})
+
+Ready to learn more? Check out our other tutorials:
+
+- [Build a panel plugin with D3.js]({{< relref "../../../../../tutorials/build-a-panel-plugin-with-d3.md" >}})
+
+### API reference
+
+Learn more about Grafana options and packages.
+
+#### Metadata
+
+- [Plugin metadata]({{< relref "metadata.md" >}})
+
+#### Typescript
+
+- [Grafana Data]({{< relref "../../packages_api/data/_index.md" >}})
+- [Grafana Runtime]({{< relref "../../packages_api/runtime/_index.md" >}})
+- [Grafana UI]({{< relref "../../packages_api/ui/_index.md" >}})
+
+#### Go
+
+- [Grafana Plugin SDK](https://pkg.go.dev/mod/github.com/grafana/grafana-plugin-sdk-go?tab=overview)