nvim: mini: Enable git

We are dropping fugitive as it is not going to be useful any more with
our switch to jujutsu.

nvim/.config/nvim/after/plugin/mini.lua

@@ -35,6 +35,8 @@ require('mini.files').setup({
     trim_right  = ''       ,
   }
 })
+-- Git, replacement for vim-fugitive
+require('mini.git').setup({})
 -- Vertical jumps/movement
 require('mini.jump2d').setup({
   allowed_lines = {