Vanilla workspaces bindings clash with persp-mode keymap

### What did you expect to happen?

`C-c w` to show a consistent set of bindings.

### What actually happened?

`C-c w` shows a (maybe accidental) mix of bindings:


Notice the ones starting with `persp-`, these ones come from:

```elisp
(setq persp-keymap-prefix (kbd "C-c w"))
```

at the beginning of [+emacs-bindings.el](https://github.com/hlissner/doom-emacs/blob/develop/modules/config/default/%2Bemacs-bindings.el).

It's not only that they look out of place in the menu by not having a proper description, but also that they seem to be random, just leftovers of the keymap.

### Describe your attempts to resolve the issue

I would like to remove the

```elisp
(setq persp-keymap-prefix (kbd "C-c w"))
```

which seems to have no role.

(Also to extend the w keymap a bit by adding `persp-add-buffer` as requested in https://github.com/hlissner/doom-emacs/issues/5570.)

### Steps to reproduce

1. In vanilla doom press `C-c w`.

### System Information

https://pastebin.com/GdZqbAjx