Centralize color settings

[rbnis]

Maybe use environment variables

Colors to start with:

            html    zsh  alt      prevzsh
Foreground: E1E1E1 (254 / E4E4E4)
Background: 2D2D2D (236 / 303030) 000 / 241?
Accent:     5FAF5F  071
AccentDark: 2B552B (022 / 005F00) 241?
Highlight:  DFAF00  178
Urgent:     900000 (160 / D70000) 88

Used in:

• dotfiles/.config/mako/config
• dotfiles/.config/rofi/config.rasi
• dotfiles/.config/sway/config
• dotfiles/.config/swaylock/config
• dotfiles/.config/termite/config

Also keep in mind the zsh-theme https://github.com/Robinhuett/dotfiles/blob/4258a772c625b5fd847f28634bf43b14140d0e18/.config/zsh/theme.conf#L8-L23

https://github.com/Robinhuett/dotfiles/blob/4258a772c625b5fd847f28634bf43b14140d0e18/.config/zsh/theme.conf#L35-L41