Docs: Setup refactor (#49739)

* builds out refactored setup topics

* Automatically fix some relrefs with mv-manager

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Use refs for tutorials content which is outside of this repository

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Manually fix complicated relrefs

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* consolidates team sync and db encryption topics

* Fix relrefs

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* updates setup index file

* Convert TOML to YAML

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Add current alias for new alerting content

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Add current aliases to new setup-grafana and configure-security pages

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Update docs/sources/setup-grafana/configure-grafana/_index.md

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* moves saml docs, updates order in TOC

* Manually fix relrefs

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* added usage insights topics, adjusted weights

* corrected relrefs

* Fix relrefs broken in rebase

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

docs/sources/plugins/_index.md

@@ -9,7 +9,7 @@ weight: 160
 
 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 "../developers/plugins/_index.md" >}}).
+You can [install]({{< relref "installation/" >}}) one of the plugins built by the Grafana community, or [build one yourself]({{< relref "../developers/plugins/" >}}).
 
 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).
 
@@ -41,6 +41,6 @@ Use app plugins when you want to create an custom out-of-the-box monitoring expe
 
 ## Learn more
 
-- [Install plugins]({{< relref "installation.md" >}})
-- [Plugin signatures]({{< relref "plugin-signatures.md" >}})
+- [Install plugins]({{< relref "installation/" >}})
+- [Plugin signatures]({{< relref "plugin-signatures/" >}})
 - Browse the available [Plugins](https://grafana.com/grafana/plugins)