Revert "Add standalone entry point for tzst"

This reverts commit 69918b4be5.

main.py

@@ -1,13 +0,0 @@
-#!/usr/bin/env python3
-"""Standalone entry point for tzst - used for PyInstaller builds."""
-
-import os
-import sys
-
-# Add the src directory to the Python path
-sys.path.insert(0, os.path.join(os.path.dirname(__file__), "src"))
-
-from tzst.cli import main
-
-if __name__ == "__main__":
-    sys.exit(main())