Simplify repo_root path logic in link checker

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

Author: Copilot

check_links.py

@@ -211,7 +211,7 @@ def main():
     md_files = []
     # 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__)) or os.getcwd()
+    repo_root = os.path.dirname(os.path.abspath(__file__))
 
     for root, dirs, files in os.walk(repo_root):
         # Skip .git directory