i3wm: import stock v4.8 config
i3wm: use vim keybindings for navigating windows

Also switch to Alt key (Mod1) for splits to free up Win+h.
xorg: initialize with stock .xinitrc
xorg: start the i3 window manager
xorg: add default .xbindkeysrc under .config

Generated with `xbindkeys --defaults`.
xorg: comment out default xbindkeys bindings
xorg: use xbindkeys and xbacklight to make Fn keys control T440p backlight
zsh: initialize with grml-zsh-config

.zshrc       is from http://git.grml.org/f/grml-etc-core/etc/zsh/zshrc
.zshrc.local is from http://git.grml.org/f/grml-etc-core/etc/skel/.zshrc
mutt: update index format to include timestamp
i3wm: use Win+p for dmenu