Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/materialtheme.vim

@@ -0,0 +1,90 @@
+" =============================================================================
+" Name: materialtheme
+" Maintainer: Günther Wutz
+" =============================================================================
+
+" =============================================================================
+" Preamble
+" =============================================================================
+
+set background=dark
+
+hi clear
+
+if exists("syntax-on")
+syntax reset
+endif
+
+let colors_name = "materialtheme"
+
+" =============================================================================
+" General colours
+" =============================================================================
+"let s:mat.accent = ['80cbc4']
+"let s:mat.grey900 = ['263238']
+"let s:mat.grey800 = ['37474F']
+"let s:mat.grey600 = ['546e7a']
+"let s:mat.grey500 = ['607d8b']
+"orange 300 ffb74d
+"amber  300 ffd54f
+"red    300 e57373
+"pink   300 f06292
+"green  300 81c784
+"blue   300 64b5f6
+
+hi Normal guibg=#263238 guifg=#eeeeec 
+hi VertSplit guibg=#263238 guifg=#263238
+hi SignColumn guibg=#263238
+hi LineNr guibg=#263238 guifg=#37474f
+hi NonText guibg=#263238 guifg=#37474f
+hi Cursor gui=none guibg=#607d8b guifg=#263238
+hi CursorLine guibg=#2b3940
+hi CursorColumn guibg=#2b3940
+hi ColorColumn guibg=#37474f
+hi SpecialKey guibg=#263238 guifg=#37474f
+hi conceal guibg=#263238
+hi FoldColumn guibg=#263238 guifg=#607d8b gui=bold
+hi PMenu guifg=#80cbc4 guibg=#37474f
+hi PMenuSel guibg=#546e7a guifg=#80cbc4
+hi SpellBad gui=undercurl guisp=#e57373 guifg=#e57373
+
+hi Folded guibg=#37474f guifg=#80cbc4 
+" No fold column support yet 
+" hi FoldColumn guifg=Orange guibg=DarkBlue
+" =============================================================================
+" Syntax highlighting
+" =============================================================================
+
+"hi Comment gui=italic guifg=#6d7e8a ctermfg=Grey
+hi Comment gui=italic guifg=#546e7a ctermfg=Grey
+hi Todo gui=bold guifg=#80cbc4 guibg=#37474f
+"hi Constant guifg=#8ae234
+hi Constant guifg=#ffd54f
+"hi Type guifg=#8AE234
+hi Type guifg=#ffb74d
+hi Function gui=bold guifg=#9BCF8D
+"hi Function gui=bold guifg=#607D8B
+"hi Statement guifg=#729FCF
+hi Statement guifg=#ff8a65
+hi Identifier guifg=#AD7FA8
+hi PreProc guifg=#e9ba6e 
+hi Special term=underline guifg=#64b5f6
+hi Number guifg=#ffd54f gui=bold
+
+hi Search guifg=#81c784 guibg=#263238 gui=bold
+hi StatusLine guibg=#546e7a guifg=#263238
+hi StatusLineNC guibg=#263238 guifg=#263238
+hi TabLineFill guibg=#263238
+hi Delimiter guifg=#607d8b
+hi MatchParen guibg=#37473f guifg=#ffb74d gui=bold
+hi markdownHeadingDelimiter guifg=#ffb74d
+hi Title gui=bold guifg=#ffb74d
+hi htmlH1 gui=bold guifg=#ffb74d
+hi htmlH2 gui=bold guifg=#ffb74d
+hi htmlH3 guifg=#ffb74d
+
+" Syntastic
+hi SyntasticError guifg=#e57373
+hi SyntasticWarning guifg=#ffd54f gui=NONE
+hi SyntasticErrorSign guifg=#e57373 gui=bold
+hi SyntasticWarningSign guifg=#ffd54f gui=bold