refactor mobile.de parser, fix country mapping, update README

mobilede_scraper/core/logs.py

@@ -39,7 +39,7 @@ def setup_logging(level: str = "INFO", log_file: str | None = None) -> None:
         root.addHandler(handler)
     root.propagate = False
     fmt = logging.Formatter(
-        "%(asctime)s | %(levelname)s | %(name)s | trace=%(trace_id)s | %(message)s"
+        "%(asctime)s | %(levelname)s | %(name)s | %(message)s"
     )
     for handler in root.handlers:
         handler.setFormatter(fmt)