Elnu's NixOS configuration

Fix GRUB resolution to match ThinkPad's native display resolution
Make rofi power menu work by removing password requirement from shutdown, reboot, etc., which is normally done with visudo (see this Stack Overflow thread and Nix sudo option.
Package safe poweroff bash script required by rofi power menu
Add volume and mute button controls to i3
Limit number of stored rollbacks to remove need for manual garbage collection
Map caps lock to escape
Theme lightdm
Theme GRUB
Limit max length of window title polybar module to prevent right-side modules from being pushed to the right with long titles
Add battery module to polybar
Find out how handling multiple hosts works so both desktop and ThinkPad configurations are buildable from flake
Load in vim configuration
Make default i3 workspace 1 instead of 10