Fix install/uninstall scripts and documentation
Ignore plug.vim

See: https://github.com/junegunn/vim-plug#usage for more info
Update installed packages
Update webapp list

See https://github.com/losingkeys/dmenu-web for more info
Increase font size
Follow the currently playing song in cmus
Fix how X is started

More info:
https://www.archlinux.org/news/xorg-server-116-is-now-available/
Update mutt config

- don't duplicate sent messages
  - thanks https://wiki.archlinux.org/index.php/Mutt#Folders
- whitespace/formatting
- simplify the index format a bit
- set vim as the editor (in case mutt is run non-interactively; e.g.
  using something like `urxvt -e mutt`)