Nvim: many small changes around whole project

.config/nvim/init.lua

@@ -1,22 +1,3 @@
 require('core.config')
 require('core.plugins')
 require('core.mappings')
-
-vim.cmd([[
-"highlight MatchParen cterm=underline ctermbg=black ctermfg=NONE
-"highlight VirtColumn ctermfg=DarkGrey ctermbg=NONE
-"hi clear SpellBad
-"hi SpellBad cterm=underline
-
-" Ctags {{{
-if isdirectory($HOME . '/.cache/nvim/tags') == 0
-	:silent !mkdir -p ~/.cache/nvim/tags > /dev/null 2>&1
-endif
-let g:gutentags_cache_dir='~/.cache/nvim/tags'
-
-if isdirectory($HOME . '/.cache/nvim/undo') == 0
-    :silent !mkdir -p ~/.cache/nvim/undo > /dev/null 2>&1
-endif
-set undodir=~/.cache/nvim/undo/
-set undofile
-]])