fix: allow serving .xml and .txt static files

Author: alvin000009238

server.py

@@ -117,7 +117,7 @@ def index():
     logger.info("Accessing index page")
     return send_from_directory('.', 'index.html')
 
-ALLOWED_STATIC_EXT = {'.html', '.css', '.js', '.json', '.png', '.jpg', '.jpeg', '.gif', '.svg', '.ico', '.woff', '.woff2', '.ttf'}
+ALLOWED_STATIC_EXT = {'.html', '.css', '.js', '.json', '.png', '.jpg', '.jpeg', '.gif', '.svg', '.ico', '.woff', '.woff2', '.ttf', '.xml', '.txt'}
 
 @app.route('/<path:filename>')
 def static_files(filename):