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/auth/auth-proxy.md

@@ -2,12 +2,7 @@
 title = "Auth Proxy"
 description = "Grafana Auth Proxy Guide "
 keywords = ["grafana", "configuration", "documentation", "proxy"]
-type = "docs"
 aliases = ["/docs/grafana/latest/tutorials/authproxy/"]
-[menu.docs]
-name = "Auth Proxy"
-identifier = "auth-proxy"
-parent = "authentication"
 weight = 200
 +++