Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/PapayaWhip.vim

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+" Vim color file
+" Maintainer:   Gerald S. Williams
+" Last Change:  2003 Apr 17
+
+" A nice light background (you guessed it, PapayaWhip) that's relatively easy
+" on the eyes yet very usable. Not nearly as "puffy" as peachpuff.
+"
+" Only values that differ from defaults are specified.
+
+set background=light
+hi clear
+if exists("syntax_on")
+  syntax reset
+endif
+let g:colors_name = "PapayaWhip"
+
+hi Normal guifg=#3f1f1f guibg=PapayaWhip ctermbg=Gray ctermfg=Black
+hi NonText guibg=Moccasin guifg=Brown ctermfg=Brown
+hi LineNr guibg=Moccasin
+hi DiffDelete guibg=LightRed guifg=Black ctermbg=DarkRed ctermfg=White
+hi DiffAdd guibg=LightGreen ctermbg=DarkGreen ctermfg=White
+hi DiffChange guibg=LightCyan3 ctermbg=DarkCyan ctermfg=White
+hi DiffText gui=NONE guibg=Gray80 ctermbg=DarkCyan ctermfg=Yellow
+hi Comment guifg=MediumBlue
+hi Constant guifg=DeepPink
+hi PreProc guifg=DarkMagenta
+hi StatusLine guibg=White guifg=#5f3705 cterm=bold ctermbg=Brown ctermfg=White
+hi StatusLineNC gui=None guibg=Gray
+hi VertSplit gui=None guibg=Gray
+hi Identifier guifg=#005f5f
+hi Statement ctermfg=DarkRed