ui: Update repository URLs to git.citron-emu.org

Updates all GitHub repository URLs to point to the new self-hosted Git instance
at git.citron-emu.org. This includes:

- Links in the About dialog UI and translations
- Android app string resources
- Documentation/wiki links
- Source code comments

The website URL (citron-emu.org) and support links remain unchanged.

src/common/threadsafe_queue.h

@@ -52,7 +52,7 @@ public:
         // cv_mutex must be held or else there will be a missed wakeup if the other thread is in the
         // line before cv.wait
         // TODO(bunnei): This can be replaced with C++20 waitable atomics when properly supported.
-        // See discussion on https://github.com/citron-emu/citron/pull/3173 for details.
+        // See discussion on https://git.citron-emu.org/Citron/Citron/pull/3173 for details.
         std::scoped_lock lock{cv_mutex};
         cv.notify_one();
     }