fix: add signal handling for graceful script termination

bin/dotf

@@ -1,9 +1,15 @@
 #!/usr/bin/env python3
 
 import os
-import sys
+import signal
 import subprocess
-from pathlib import Path
+import sys
+
+def signal_handler(sig, frame):
+    print('Exiting.')
+    sys.exit(0)
+
+signal.signal(signal.SIGINT, signal_handler)
 
 # Script constants
 DOTFILES_ROOT = os.path.expanduser("~/.dotfiles")