[gtksourceview] (21 commits) ...Merge branch 'gi-docgen' of gitlab.gnome.org:bilelmoussaoui/gtksourceview

[Christian Hergert <chergert src gnome org>]

Summary of changes:

  1851134... build: migrate from gtk-doc to gi-docgen
  654f6f4... drop unneeded version guards checks
  36759e5... g-i: drop uneeded since annotations
  ce93366... docs: port types sections to gi-docgen
  8f08646... docs: port links to the gi-docgen way
  0e5d356... docs: add a logo
  f954647... docs: port the migration guide from 3-> 4 to markdown
  8910ee5... docs: port the migration guide from 4 -> 5 to markdown
  1877c20... docs: port the lang tutorial to markdown
  c80dbe3... docs: port the intro to markdown
  0806f3f... docs: port the style reference to markdown
  c79cb58... docs: port the lang reference to markdown
  fdc1171... docs: drop the old gtk-doc
  f478af2... misc: drop + from GTK
  35e16b1... CI: bump to a newer fedora image
  6ecd8e2... CI: update per gi-docgen docs changes
  1c8e4d7... docs: add a urlmap
  02737bb... docs: update links to the new additional docs
  39f2e57... bump required glib to 2.70 & gobject-introspection to 1.70
  a4bffbc... CI: use the new fedora image
  33ceffd... Merge branch 'gi-docgen' of gitlab.gnome.org:bilelmoussaoui