Update branch references from dev to main, refresh users and GitHub data

- Switch all CI, dependabot, and docs references from dev to main
- Update users list and screenshots via processUsers
- Refresh contributors and sponsors data

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

exampleSite/content/users/users.json

@@ -1047,10 +1047,10 @@
   },
   {
     "title": "www.gsking.co.uk",
-    "url": "www.gsking.co.uk",
+    "url": "https://www.gsking.co.uk",
     "source": "n/a",
     "tags": [
       "Personal site"
     ]
   }
-]
+]