mdcat is nicer for man.

vim/after/syntax/man.vim

@@ -1,2 +0,0 @@
-hi! Normal ctermbg=NONE guibg=NONE
-hi! NonText ctermbg=NONE guibg=NONE

vim/vimrc

@@ -44,9 +44,6 @@ set winminheight=0
 
 set viminfofile=$XDG_CACHE_HOME/viminfo
 
-runtime ftplugin/man.vim
-autocmd FileType man setlocal nogdefault nonumber nocursorcolumn
-
 nmap <tab> <C-w>w
 nmap <Esc><CR> :wq!<CR>
 nmap <C-p> :Files<CR>

zsh/.zshrc

@@ -10,7 +10,7 @@ setopt SHARE_HISTORY
 export PATH=~/.local/bin:$PATH
 export EDITOR=vim
 export VIMINIT='let $MYVIMRC="$XDG_CONFIG_HOME/vim/vimrc" | source $MYVIMRC'
-export MANPAGER="vim -R -M +MANPAGER"
+export MANPAGER="mdcat -p"
 export LESSHISTFILE='/dev/null'
 
 mkdir -p $XDG_DATA_HOME/zsh