feat(modules/base.nix): add more cache mirrors

docs: README

Merge pull request ryan4yin#118 from ryan4yin/astronvim-v4

feat: upgrade astronvim to v4

docs: virtual machines running on kubevirt

Merge pull request ryan4yin#96 from ryan4yin/darwin-eval-tests

feat(tests): add eval tests for darwin systems

docs: how to add a new machine

Merge pull request ryan4yin#77 from ryan4yin/use-optionals

refactor: use lib.optionals instead of if...then...else

refactor: var_networking.ssh

feat: ignore polybar's scripts in github linguist, it's copied from a…

…nother repo

docs: neovim & emacs