[gimp-web/master] (25 commits) ...Merge remote-tracking branch 'origin/testing'

[Jehan <jehanp src gnome org>]

Summary of changes:

  48a9e96... content, tools: update Kumi Systems URL. (*)
  bacc877... content, tools: update name and URL for GWDG mirror. (*)
  5e77280... Fix issues with links on page (*)
  c80a7e5... devel-docs: add a quick docs for news writing. (*)
  7284744... devel-docs: fix the new document rendering. (*)
  e244614... Use a higher resolution favicon (*)
  e43264c... content: changing DotSrc.org mirror name. (*)
  3390bdd... content, tools: update University of Crete's mirror URI. (*)
  c1f28e1... content, tools: directory change for DotSrc.org as well. (*)
  33ef017... content, tools: also update Kumi Systems mirror URL. (*)
  feed3a6... Add thank you first page (*)
  2bb6c54... content, themes: redirect to "thank you" page after downloa (*)
  ff9fc30... content: improve a bit the thank you page. (*)
  97bf5f2... themes: update macOS third-party downloads section. (*)
  aed2478... content, themes: merging irc and mailing lists pages into a (*)
  099c1df... themes: some English fix and rewording in downloads page. (*)
  6ab20f5... content: add internal link when writing about "archives of  (*)
  801a2d3... content: update gitlab URLs for mirrors. (*)
  85ce3d4... content: add a section on how to contribute to tutorials. (*)
  6311d6c... content: fix irc.html and mail_lists.html links. (*)
  8d5ffdb... content, tools: add mirror by Get Hosted Online. (*)
  2f265e2... content: release GIMP 2.10.28 on macOS. (*)
  71df72b... content: add a link back from "thank you" to "downloads" pa (*)
  ea36e7e... themes: make the downloads→thanks redirection happen on dev (*)
  0b7bc05... Merge remote-tracking branch 'origin/testing'

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