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/whatsnew/whats-new-in-v7-0.md

@@ -1,14 +1,9 @@
 +++
-title = "What's New in Grafana v7"
+title = "What's New in Grafana v7.0"
 description = "Feature and improvement highlights for Grafana v7"
 keywords = ["grafana", "new", "documentation", "7.0", "release notes"]
-type = "docs"
 aliases = ["/docs/grafana/latest/guides/whats-new-in-v7-0/"]
-[menu.docs]
-name = "Version 7.0"
-identifier = "v7.0"
-parent = "whatsnew"
-weight = -17
+weight = -27
 +++
 
 # What's new in Grafana v7.0