bashrc, zshrc: vim aliases; vimplugrc: get rid of gvim, I do not use it anyway

vimplugrc

@@ -42,22 +42,18 @@ nmap <Leader>ft :Filetypes<CR>
 " vimwiki
 let g:vimwiki_list = [{'path': '$HOME/vimwiki/', 'syntax': 'markdown', 'ext': '.md'}]
 
-" colorscheme and gui
-if has('gui_running')
-    set bg=dark
-    set guifont=JetBrains\ Mono\ 10
-    set guicursor=a:blinkon0,a:block,i:ver1-Cursor/lCursor,r:hor1-Cursor/lCursor
-    set guiheadroom=0 guioptions=aei mouse=a
-
-    map <S-Insert> <MiddleMouse>
-    map! <S-Insert> <MiddleMouse>
+" colorschemes
+if $TERM =~ '^tmux' || $TERM =~ '^xterm' || $TERM =~ '^st'
+    set bg=dark tgc
+    let g:gruvbox_filetype_hi_groups = 1
+    let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
+    let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
 
     colorscheme gruvbox8
 elseif $TERM !~ '^linux'
     set bg=light
-    let g:solarized_use16 = 1
-    let g:solarized_italics = 1
     let g:solarized_extra_hi_groups = 1
+    let g:solarized_use16 = 1
 
     colorscheme solarized8
 endif