Add nix syntax plugin

vimrc

@@ -34,7 +34,7 @@ set laststatus=2                        "
 set mouse=a                             " Enable mouse support
 set showcmd                             " Show command while writing it
 set ruler                               " Show line/column position
-set vb t_vb=                            " Disable visual beep
+set novb                                " Disable visual beep
 
 set nobackup                            " Disable ~backup
 set noswapfile                          " Disable swap files
@@ -61,7 +61,8 @@ set smartindent                         "
 set noshowmode                          "
 
 syntax on                               " Syntax highlighting
-source colors.vim
+source $XDG_CONFIG_HOME/vim/colors.vim
+
 
 " Titlebar without “-VIM”
 set titlestring=%t%(\ %M%)%(\ (%{expand(\"%:p:h\")})%)%(\ %a%)
@@ -94,6 +95,7 @@ Plugin 'townk/vim-autoclose'
 Plugin 'tpope/vim-fugitive'
 Plugin 'travitch/hasksyn'
 Plugin 'tpope/vim-markdown'
+Plugin 'jgertm/nix.vim'
 Plugin 'ervandew/supertab'
 Plugin 'majutsushi/tagbar'
 Plugin 'scrooloose/syntastic'