Make link checker script portable and environment-agnostic

Co-authored-by: felickz <1760475+felickz@users.noreply.github.com>

Author: Copilot

check_links.py

@@ -195,7 +195,9 @@ def check_links_parallel(self, links: List[Tuple[str, str, int]]) -> List[Dict]:
 def main():
     # Find all markdown files
     md_files = []
-    repo_root = '/home/runner/work/awesome-codeql/awesome-codeql'
+    # Use the directory where the script is located as the repository root
+    # This makes the script work from any location
+    repo_root = os.path.dirname(os.path.abspath(__file__)) if os.path.dirname(os.path.abspath(__file__)) else os.getcwd()
 
     for root, dirs, files in os.walk(repo_root):
         # Skip .git directory