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/SETUP-RU.md b/SETUP-RU.md
index 7d7d04c..3306d58 100755
--- a/SETUP-RU.md
+++ b/SETUP-RU.md
@@ -1,4 +1,4 @@
-[English version 🇬🇧](/skunky/SkunkyArt/src/branch/master/SETUP.md)
+[English version 🇬🇧](SETUP.md)
 
 # Единицы измерения
 Размер файла в кеше измеряется в мегабайтах.<br>