Switch to mini.comment from comment.nvim

Even though v0.10.0 introduced builtin support for `gc{motion}` to
toggle comments it does not support ignoring blank lines. Also switch to
using mini.comment as its the same author as the builtin support.

lua/plugins/comment.lua

@@ -1,10 +0,0 @@
-return {
-  -- TODO: v0.10.0 Added built-in |commenting| support.
-  'terrortylor/nvim-comment',
-  config = function()
-    require('nvim_comment').setup({
-      -- should comment out empty or whitespace only lines
-      comment_empty = false,
-    })
-  end
-}

lua/plugins/utilities.lua

@@ -33,12 +33,8 @@ local noice = {
 
 return {
   -- noice,
-  {
+  { 'echasnovski/mini.comment',  opts = { options = { ignore_blank_line = true } } },
-    'tummetott/unimpaired.nvim',
+  { 'tummetott/unimpaired.nvim', opts = {} },
-    config = function()
-      require('unimpaired').setup({})
-    end
-  },
   { 'stevearc/dressing.nvim' },
   { 'kevinhwang91/nvim-bqf' },
 }