moved gitolite retirement to its own milestone

roadmap/2023.md

@@ -19,7 +19,9 @@ Those are the big projects for 2023:
    * self-hosting Discourse?
  * [complete the cymru migration](https://gitlab.torproject.org/groups/tpo/tpa/-/milestones/2)
  * [old service retirements](https://gitlab.torproject.org/groups/tpo/tpa/-/milestones/7)
-   * retire gitolite/gitweb (e.g. execute TPA-RFC-36)
+   * retire gitolite/gitweb (e.g. execute
+     [TPA-RFC-36](https://gitlab.torproject.org/tpo/tpa/team/-/wikis/policy/tpa-rfc-36-gitolite-gitweb-retirement),
+     now [its own milestone](https://gitlab.torproject.org/groups/tpo/tpa/-/milestones/11))
    * retire SVN (e.g. execute TPA-RFC-11)
    * monitoring system overhaul ([TPA-RFC-33](https://gitlab.torproject.org/tpo/tpa/team/-/issues/40755))
  * [deploy a Puppet CI](https://gitlab.torproject.org/groups/tpo/tpa/-/milestones/8#tab-issues)