[urxvt] Clean up formatting
[dircolors] Add colors for COPYING, .ac, and .am files
[i3] Add keybindings for quickswitch.py
x11: Use Vanilla-DMZ-AA cursor theme
bash: Disable checking of mail
bash: Unset HISTFILESIZE rather than clearing it
bash: Use non-bold green and blue in prompt
bash: Make prompt nicer
bash,zsh: Move environment-related conf to .env.sh
bash,zsh: Move aliases to .aliases.sh

Also properly source .env.sh
i3: Use urxvt, not urxvt256c
i3: Use mpd instead of cmus
i3: Move lockscreen binding into exit mode
i3: Use more fine-grained control for backlight
i3: Add note to refactor configuration
i3: Use new device name for ethernet
x11: Start redshift on login
x11: (commented out) Start unclutter on login