fix: convert git_monitor to proper package and fix absolute imports for PyInstaller compatibility

git_monitor/git_manager.py

@@ -1,7 +1,7 @@
 import os
 from git import Repo, exc
-from logger import logger
-from notifier import notifier
+from git_monitor.logger import logger
+from git_monitor.notifier import notifier
 
 class GitManager:
     def __init__(self, repo_path=None):