chore: repoint URLs at git.swaits.com and bump for release

Rewrites remaining github.com / git.sr.ht references to git.swaits.com,
translating GitHub URL shapes to Gitea's (/blob/<ref>/ -> /src/branch/<ref>/,
/tree/<tag> -> /src/tag/<tag>, /actions/workflows/X -> /actions?workflow=X,
/edit/ -> /_edit/).

Left pointing at GitHub on purpose: pull-request links (PRs were not migrated)
and GitHub-only surfaces Gitea lacks (security advisories, discussions).

README.md

@@ -16,7 +16,7 @@ GPU-rendered ring light overlay for Wayland. Simulates a monitor-mounted ring li
 ### From source
 
 ```sh
-git clone https://github.com/swaits/ringa.git
+git clone https://git.swaits.com/swaits/ringa.git
 cd ringa
 cargo install --path .
 ```