Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/cthulhian.vim

@@ -0,0 +1,41 @@
+" -- Init ------------------------------------------------------------------------------------------
+
+set background=dark
+highlight clear
+if exists("syntax_on")
+	syntax reset
+endif
+
+runtime colors/oceandeep.vim
+
+let g:colors_name = "cthulhian"
+
+" -- Clear some stuff ------------------------------------------------------------------------------
+
+highlight clear Folded
+highlight clear FoldColumn
+highlight clear LineNr
+highlight clear SpecialKey
+highlight clear StatusLine
+highlight clear StatusLineNC
+highlight clear Comment
+highlight clear Conditional
+highlight clear Repeat
+highlight clear Special
+highlight clear Underlined
+highlight clear Todo
+
+" -- Do some redefinitions -------------------------------------------------------------------------
+
+highlight Folded	guibg=#305060 guifg=#b0d0e0
+highlight FoldColumn	guibg=#305060 guifg=#b0d0e0
+highlight LineNr	gui=NONE guifg=#007777 guibg=NONE
+highlight SpecialKey	guibg=bg guifg=SeaGreen
+highlight StatusLine	gui=BOLD guifg=#c9c9c9 guibg=#4e4e6e
+highlight StatusLineNC	gui=NONE guifg=#b9b9b9 guibg=#3e3e5e
+highlight Comment	gui=None guifg=#708090
+highlight Conditional	gui=Bold guifg=LightGreen guibg=bg
+highlight Repeat	gui=Bold guifg=SeaGreen2 guibg=bg
+highlight Special	gui=None guifg=#dd88ff
+highlight Underlined	gui=underline guifg=honeydew3 guibg=bg
+highlight Todo		gui=underline guifg=Cyan guibg=#507080