Docs: updates for file-based menu (#28500)

* initial

* cleanup

* remove bad aliases

* cleanup, fix links

* add docs-file-based-command

* update docs

* update readme

* fix broken links

* fix spelling

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/datasources/add-a-data-source.md

@@ -1,11 +1,6 @@
 +++
 title = "Add data source"
-type = "docs"
 aliases = ["/docs/grafana/latest/features/datasources/add-a-data-source/"]
-[menu.docs]
-name = "Add a data source"
-identifier = "add_data_source"
-parent = "features"
 weight = 100
 +++
 
@@ -23,7 +18,7 @@ Before you create your first dashboard, you need to add your data source. Follow
 
     {{< docs-imagebox img="/img/docs/v52/add-datasource.png" max-width="700px" class="docs-image--no-shadow">}}
 
-1. In the **Name** box, enter a name for this data source. 
+1. In the **Name** box, enter a name for this data source.
 
     {{< docs-imagebox img="/img/docs/v52/datasource-settings.png" max-width="700px" class="docs-image--no-shadow">}}