vimrc: add commented-out firenvim config

vimrc

@@ -102,6 +102,7 @@ Plug 'SirVer/ultisnips'
 Plug 'honza/vim-snippets'
 
 Plug 'nanotech/jellybeans.vim'
+Plug 'sonph/onehalf', { 'rtp': 'vim' }
 
 Plug '~/dgapt', { 'rtp': 'vim' }
 " Plug '~/lean.vim'
@@ -123,6 +124,8 @@ Plug 'dag/vim-fish'
 
 Plug 'elixir-editors/vim-elixir'
 
+" Plug 'glacambre/firenvim', { 'do': { _ -> firenvim#install(0) } }
+
 call plug#end()
 
 filetype plugin indent on
@@ -147,7 +150,13 @@ set title
 let g:jellybeans_overrides = {
   \    'background': { 'guibg': '000000' },
   \}
-colors jellybeans
+
+if exists('g:started_by_firenvim')
+  set bg=light
+  colors onehalflight
+else
+  colors jellybeans
+endif
 
 au syntax java  setl ts=4 sts=4 sw=4