[gtk] (9 commits) Non-fast-forward update to branch doc-chapters-markdown

[Matthias Clasen <matthiasc src gnome org>]

The branch 'doc-chapters-markdown' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  f2ce967... wip: Include markdown content, via pandoc

Commits added to the branch:

  ca1c570... gtk-demo: Stop using appmenu apis (*)
  6c31092... examples: Stop using appmenu apis (*)
  a8df81b... inspector: Drop app-menu support (*)
  d5da3b9... print-editor: Stop using appmenu apis (*)
  79d6a77... gtkapplication: Drop app menu support (*)
  1038b9b... docs: Mention app menus in the migration guide (*)
  5e25ba6... Merge branch 'no-app-menu' into 'master' (*)
  ffa5334... Merge branch 'matthiasc/for-master' into 'master' (*)
  d7c1f46... wip: Include markdown content, via pandoc

(*) This commit already existed in another branch; no separate mail sent