fix: point source links and instance fetch at this fork

Upstream references still pointed at git.macaw.me, which is unmaintained
and whose instances.json is a dead link. Repoint them at this repo:

- RefreshInstances now fetches instances.json from raw.githubusercontent
- source/version links in index.htm, about.htm, and CLI help use the
  GitHub releases tag URL
- SETUP.md/SETUP-RU.md language switch links were Gitea-absolute paths
  that 404 on GitHub; make them relative
- --add-instance message says 'main' branch, matching this repo

The fork attribution in README.md is left as-is: it credits upstream
rather than pointing at the source.

1 files changed, 1 insertions, 1 deletions

diff --git a/static/html/about.htm b/static/html/about.htm
index ae2da3f..6007806 100755
--- a/static/html/about.htm
+++ b/static/html/about.htm
@@ -44,6 +44,6 @@
                 {{end}}
             </ul>
         </details>
-        <p>Copyright <a href="https://go.kde.org/matrix/#/@ls:gnulinux.club" target="_blank">lost+skunk</a>, X11. <a href="https://git.macaw.me/skunky/skunkyart/src/tag/v{{.Version}}" target="_blank">SkunkyArt v{{.Version}}</a></p>
+        <p>Copyright <a href="https://go.kde.org/matrix/#/@ls:gnulinux.club" target="_blank">lost+skunk</a>, X11. <a href="https://github.com/zerolabsco/skunky-art/releases/tag/v{{.Version}}" target="_blank">SkunkyArt v{{.Version}}</a></p>
     </main>
 </html>