Update docs/maintenance-and-troubleshooting.md: remove a section for ma1sd

As the project has not updated since several years, it does not seem to be reasonable to pick it up specially on the document.

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/maintenance-and-troubleshooting.md

@@ -51,7 +51,3 @@ The shortcut command with `just` program is also available: `just run-tags run-d
 ## Postgres
 
 See the dedicated [PostgreSQL Maintenance](maintenance-postgres.md) documentation page.
-
-## Ma1sd
-
-See the dedicated [Adjusting ma1sd Identity Server configuration](configuring-playbook-ma1sd.md) documentation page.