Gruvbox Light Theme per Bullfinch

Based on the Gruvbox Light color scheme:
https://github.com/morhetz/gruvbox

More Gruvbox themes:
https://addons.vaultpit.io/en-US/firefox/addon/gruvbox-dark-theme-firefox/
https://addons.vaultpit.io/en-US/firefox/addon/gruvbox-material-soft-theme/

More light themes:
https://addons.vaultpit.io/en-US/firefox/addon/rose-pine-dawn-light-theme/
https://addons.vaultpit.io/en-US/firefox/addon/solarized-light-theme/
https://addons.vaultpit.io/en-US/firefox/addon/kanagawa-lotus-light-theme/
https://addons.vaultpit.io/en-US/firefox/addon/everforest-light-soft-theme/
https://addons.vaultpit.io/en-US/firefox/addon/horizon-bright-theme/
https://addons.vaultpit.io/en-US/firefox/addon/nord-light-theme/
https://addons.vaultpit.io/en-US/firefox/addon/sunny-peach-light-theme/