fix(sites): Remove BoardGameGeek - unreliable detection

BoardGameGeek returns identical pages for both existing and non-existing
users, making reliable username detection impossible with HTTP-based
methods. The site likely uses JavaScript to load user-specific content
dynamically.

sherlock_project/resources/data.json

@@ -278,13 +278,6 @@
     "urlMain": "https://bsky.app/",
     "username_claimed": "mcuban"
   },
-  "BoardGameGeek": {
-    "errorType": "status_code",
-    "regexCheck": "^[a-zA-Z0-9_]*$",
-    "url": "https://boardgamegeek.com/profile/{}",
-    "urlMain": "https://boardgamegeek.com",
-    "username_claimed": "blue"
-  },
   "BongaCams": {
     "errorType": "status_code",
     "isNSFW": true,