Remove temp files, and ensure it won't happen again

The repo contains a couple Vim swap files (.swp) which should not be
committed.  Delete them, and add "*.swp" to .gitignore to prevent
it from occuring in the future.

Author: mew-cx

.gitignore

@@ -5,3 +5,4 @@ Hue_Controller/secrets.h
 CircuitPython_Logger/secrets\.py
 .python-version
 __pycache__
+*.swp