Revert palette to Emacs Gruvbox original.
Revert palette to Emacs Gruvbox original.

- TODO: Create Vim-like variant
- TODO: Create Gruvbox Light

ninrod/gruvbox-theme,greduan/emacs-theme-gruvbox,zzgraph/emacs-theme-gruvbox,greduan/emacs-theme-gruvbox,ninrod/gruvbox-theme,zzgraph/emacs-theme-gruvbox,greduan/emacs-theme-gruvbox,zzgraph/emacs-theme-gruvbox