General refactor of Doom core

- Code reduction and refactor across the board (cull unneeded minor
  advise, hooks and hacks or update them)
- Revise outdated comments and docstrings
- Reorganize core autoload libraries
- Remove large file check (Emacs already has a built-in one, which we
  augment to be even more performant when it does kick in)
- helpful.el can now be disabled completely through package!

modules/config/default/autoload/default.el

@@ -34,18 +34,6 @@
 (defun +default/find-in-notes ()
   (interactive) (doom-project-find-file org-directory))
 
-;;;###autoload
-(defun +default/find-in-config ()
-  "Open a file somewhere in `doom-private-dir' via a fuzzy filename search."
-  (interactive)
-  (doom-project-find-file doom-private-dir))
-
-;;;###autoload
-(defun +default/browse-config ()
-  "Browse the files in `doom-private-dir'."
-  (interactive)
-  (doom-project-browse doom-private-dir))
-
 ;;;###autoload
 (defun +default/compile (arg)
   "Runs `compile' from the root of the current project.