~shom/alacritty-auto-theme

Manual override and fixed typo in alias
Create ~/.config/systemd/user/ if it doesn't exist
Added MIT License
Intial commit for standalone repo

This automated theme switching was not a good fit for the themes repo
so I made it into a standalone repo based on feedback from this pull
request: https://github.com/alacritty/alacritty-theme/pull/74