Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/sand.vim

@@ -0,0 +1,30 @@
+" Vim color file
+" Maintainer:   Tim Alexeevsky <realtim@mail.ru>
+" Last Change:  2002-03-14 
+" Version:      0.5
+" URL:		    http://sunsite.cs.msu.su/~tim/vim/sand.vim 
+" 
+" Thanx to Hans Fugal for his colorscheme_template.vim
+
+set background=light
+hi clear
+if exists("syntax_on")
+    syntax reset
+endif
+let g:colors_name="sand"
+
+highlight Normal guibg=cornsilk guifg=NONE
+highlight PreProc guibg=NONE guifg=Maroon4
+highlight Comment guibg=NONE guifg=SteelBlue4
+highlight Constant guibg=NONE guifg=NavajoWhite4
+highlight Special guibg=NONE guifg=SlateBlue4
+highlight Identifier guibg=NONE guifg=SeaGreen
+highlight Statement guibg=NONE guifg=bisque4
+highlight Type guibg=NONE guifg=DarkOliveGreen
+highlight Todo guibg=LightYellow3 guifg=Blue4
+highlight NonText guibg=NONE guifg=DarkGreen
+highlight LineNr guibg=NONE guifg=Brown
+highlight StatusLineNC guifg=#8090a0
+highlight StatusLine guifg=#005070
+
+"vim: tw=0 sw=3 ts=3 sts=3 et