[gtk] (5 commits) Non-fast-forward update to branch wip/baedert/box2

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/box2' 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:

  ef7d281... box: Simpify documentation
  141abcf... colorchooser: Remove extra custom color
  c577512... box: Remove gtk_box_pack_end
  154f9bc... box: Remove gtk_box_pack_start
  4048a47... migration guide: Add a paragraph about GtkBox's pack-type

Commits added to the branch:

  56d042c... box: Simplify documentation
  b0a084f... box: Remove gtk_box_pack_end
  670ce39... box: Remove gtk_box_pack_start
  4c198aa... migration guide: Add a paragraph about GtkBox's pack-type
  150951e... colorchooser: Remove extra custom color