nvim improvements

[aleeusgr]

• [ ] fix Tab and auto indent.
  • [x] vimrc,
  • [x] #52
• [x] git integration
  • [x] try using :!git in vim
• [x] #56

[aleeusgr]

[coc.nvim]: Unhandled response error -32097 from language server: Pending response rejected since connection got disposed

https://cardano.stackexchange.com/search?q=vim