GitLab: update ikiwiki shortcuts

In passing, remove a few unused ones.

wiki/src/news/test_3.12-rc1.mdwn

@@ -37,7 +37,7 @@ method (see below). :)
 - Fix Totem's access to the Internet when it's started from the
   Applications menu.
 
-For more details, read our [[!tails_testing_gitweb debian/changelog desc="changelog"]].
+For more details, read our [[!tails_gitweb debian/changelog desc="changelog"]].
 
 Known issues
 ==============

wiki/src/shortcuts.mdwn

@@ -91,15 +91,11 @@ ikiwiki will include your shortcut in the standard underlay.
   desc="list of *Starter* tasks"]]
 * [[!shortcut name=tails_ticket url="https://redmine.tails.boum.org/code/issues/%S" desc="#%s"]]
 * [[!shortcut name=tails_roadmap url="https://tails.boum.org/contribute/roadmap" desc="roadmap"]]
-* [[!shortcut name=tails_gitweb url="https://git.tails.boum.org/tails/plain/%S"]]
-* [[!shortcut name=tails_gitweb_dir url="https://git.tails.boum.org/tails/tree/%S"]]
-* [[!shortcut name=tails_devel_gitweb url="https://git.tails.boum.org/tails/plain/%S?h=devel"]]
-* [[!shortcut name=tails_devel_gitweb_dir url="https://git.tails.boum.org/tails/tree/%S?h=devel"]]
-* [[!shortcut name=tails_testing_gitweb url="https://git.tails.boum.org/tails/plain/%S?h=testing"]]
-* [[!shortcut name=tails_testing_gitweb_dir url="https://git.tails.boum.org/tails/tree/%S?h=testing"]]
-* [[!shortcut name=tails_gitweb_branch url="https://git.tails.boum.org/tails/log/?h=%S"]]
-* [[!shortcut name=tails_gitweb_commit url="https://git.tails.boum.org/tails/commit/?id=%s"]]
-* [[!shortcut name=tails_gitweb_repo url="https://git.tails.boum.org/%S"]]
+* [[!shortcut name=tails_gitweb url="https://gitlab.tails.boum.org/tails/tails/-/blob/master/%S"]]
+* [[!shortcut name=tails_gitweb_dir url="https://gitlab.tails.boum.org/tails/tails/-/tree/master/%S"]]
+* [[!shortcut name=tails_gitweb_branch url="https://gitlab.tails.boum.org/tails/tails/-/commits/%S/"]]
+* [[!shortcut name=tails_gitweb_commit url="https://gitlab.tails.boum.org/tails/tails/-/commit/%s"]]
+* [[!shortcut name=tails_gitweb_repo url="https://gitlab.tails.boum.org/tails/%S"]]
 * [[!shortcut name=launchpad_bug url="https://bugs.launchpad.net/onboard/+bug/%s" desc="Launchpad bug #%s"]]
 * [[!shortcut name=tor_bug
   url="https://bugs.torproject.org/%s" desc="bug #%s on Tor Project's Trac"]]