Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/wikipedia.vim

@@ -0,0 +1,40 @@
+" Wikipedia colorscheme
+" License: MIT
+set background=light
+
+if version > 580
+    hi clear
+    if exists("syntax_on")
+        syntax reset
+    endif
+endif
+
+let colors_name = "wikipedia"
+
+hi TabLine      NONE
+hi link TabLine TabLinefill
+hi Normal       cterm=none ctermbg=White ctermfg=Black
+hi Error        cterm=none ctermbg=Red   ctermfg=Black
+hi StatusLine   cterm=none ctermfg=White ctermbg=Black
+hi StatusLineNC cterm=none ctermfg=Grey  ctermbg=Black
+hi LineNr       cterm=none ctermfg=Black ctermbg=LightGrey
+
+hi diffFile     cterm=bold
+hi diffLine     ctermfg=DarkCyan
+hi diffAdded    ctermfg=DarkGreen
+hi diffRemoved  ctermfg=DarkRed
+
+hi Normal     term=none      cterm=none   ctermfg=0   ctermbg=255
+hi Comment    term=bold      cterm=italic ctermfg=73
+hi Constant   term=underline cterm=none   ctermfg=1
+hi Special    term=bold      cterm=none   ctermfg=0
+hi Identifier term=underline cterm=none   ctermfg=0
+hi Statement  term=bold      cterm=none   ctermfg=22
+hi PreProc    term=underline cterm=none   ctermfg=94
+hi Type       term=underline cterm=none   ctermfg=89
+hi Number     term=bold      cterm=none   ctermfg=8
+hi Visual     term=bold      cterm=none   ctermbg=251
+hi Search     term=bold      cterm=none   ctermbg=224
+hi CursorLine term=none      cterm=none   ctermbg=253
+hi Title      term=none      cterm=none   ctermfg=4
+hi Function   term=none      cterm=none   ctermfg=21