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/http_api/alerting.md

@@ -3,10 +3,6 @@ title = "Alerting HTTP API "
 description = "Grafana Alerts HTTP API"
 keywords = ["grafana", "http", "documentation", "api", "alerting", "alerts"]
 aliases = ["/docs/grafana/latest/http_api/alerting/"]
-type = "docs"
-[menu.docs]
-name = "Alerting"
-parent = "http_api"
 +++
 
 # Alerting API