fix(sites): Remove BoardGameGeek due to incompatible detection

BoardGameGeek cannot be reliably detected with Sherlock's current capabilities:

- Original HTML detection: Returns false positives
- API endpoint approach: The API returns status 200 for both valid and invalid users
  - Invalid user: Returns exactly '[]'
  - Valid user: Returns JSON containing '[]' substrings (e.g., "adminBadges":[])

Since Sherlock's 'message' errorType uses substring matching, it incorrectly
identifies valid users as "not found" when checking for '[]' in the response.

The site's API response format is fundamentally incompatible with Sherlock's
detection methods (message/status_code/response_url), so removal is the only
viable solution to prevent false positives and false negatives.

Addresses false positive issue originally reported in testing.

sherlock_project/resources/data.json

@@ -278,15 +278,6 @@
     "urlMain": "https://bsky.app/",
     "username_claimed": "mcuban"
   },
-  "BoardGameGeek": {
-    "errorMsg": "[]",
-    "errorType": "message",
-    "regexCheck": "^[a-zA-Z0-9_]*$",
-    "url": "https://boardgamegeek.com/profile/{}",
-    "urlMain": "https://boardgamegeek.com",
-    "urlProbe": "https://api.geekdo.com/api/users?username={}",
-    "username_claimed": "blue"
-  },
   "BongaCams": {
     "errorType": "status_code",
     "isNSFW": true,