Reapply "added mark to easily jump large files"

This reverts commit e50e2172d9.

init.lua

@@ -199,6 +199,9 @@ require('lazy').setup({
   {
     'michaeljsmith/vim-indent-object',
   },
+  {
+    'kshenoy/vim-signature',
+  },
   -- Alternatively, use `config = function() ... end` for full control over the configuration.
   -- If you prefer to call `setup` explicitly, use:
   --    {