[v9.0.x] Use relative aliases for all non-current Grafana aliases (#60112)

* Use relative aliases for all non-current Grafana aliases

Prevents non-latest documentation "stealing" the page away from latest
and through permanent redirects for latest pages that no longer exist.

The redirected pages are indexed by search engines but our robots.txt
forbids them crawling the non-latest page.

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

* Remove all current page aliases

find docs/sources -type f -name '*.md' -exec sed -z -i 's#\n *- /docs/grafana/next/[^\n]*\n#\n#' {} \;
find docs/sources -type f -name '*.md' -exec sed -z -i 's#\n *- /docs/grafana/latest/[^\n]*\n#\n#' {} \;
find docs/sources -type f -name '*.md' -exec sed -Ez -i 's#\n((aliases:\n *-)|aliases:\n)#\n\2#' {} \;

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

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

docs/sources/developers/plugins/add-authentication-for-data-source-plugins.md

@@ -1,8 +1,6 @@
 ---
 aliases:
-  - /docs/grafana/latest/developers/plugins/add-authentication-for-data-source-plugins/
-  - /docs/grafana/latest/plugins/developing/auth-for-datasources/
-  - /docs/grafana/next/developers/plugins/authentication/
+  - ../../plugins/developing/auth-for-datasources/
 title: Add authentication for data source plugins
 ---