[vim] deprecate vimwiki
[vim] deprecate vimwiki

1. formatoptions += mM to enable format for multiple byte characters
2. add `vim-pencil` for better writing mode
3. remove vimwiki, now use plain markdown files
4. rust settings, correct rust src path
5. settings for vim-markdown

lotabout/dotfiles,lotabout/dotfiles,lotabout/dotfiles,lotabout/dotfiles