Point links at git.coffeylabs.org after the move from GitHub

GitHub took the organization's repos and GHCR offline on 2026-09-20. Repo,
release, raw-file and clone links now go to Gitea at git.coffeylabs.org,
container images to registry.coffeylabs.org, and GitLab-style /-/blob paths
to Gitea's /src/branch form. Go module paths are identifiers and stay as
they are; links to GitHub issues and pull requests are left as history.

package.json

@@ -29,10 +29,10 @@
   "author": "John Coffey",
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/jcoffey-dev/great-powers.git"
+    "url": "git+https://git.coffeylabs.org/jcoffey-dev/great-powers.git"
   },
   "homepage": "https://games.jcoffey.dev/powers/",
   "bugs": {
-    "url": "https://github.com/jcoffey-dev/great-powers/issues"
+    "url": "https://git.coffeylabs.org/jcoffey-dev/great-powers/issues"
   }
 }