document non-migrated things

tsa/howto/gitlab.mdwn

@@ -80,6 +80,27 @@ been "moved" to the respective projects. @ahf, who did the migration,
 maintained a [copy of the mapping](https://anubis.0x90.dk/~ahf/sekrit/tor/gitlab/component-tickets.txt) for those looking for their old
 stuff.
 
+### Not migrated
+
+We are *not* migrating away from Gitolite and Jenkins just yet. Those
+services are still operational and still the reference services for
+source code hosting and continuous integration. Those services *might*
+eventually be migrated to GitLab, but that's part of a future
+migration plan.
+
+We also do not host "GitLab pages", the static site hosting provided
+by GitLab.
+
+The priority of those features would be:
+
+ 1. gitolite replacement and migration
+ 2. CI deployment, with people migrating their own job from Jenkinks
+    and TPA shutting down Jenkins on a flag date
+ 3. GitLab pages replacement and migration from the current static
+    site hosting system
+
+Those are each large projects and will be undertaken at a later stage,
+progressively.
 
 ### Interesting new features