audit acorn wp-cli commands — some commands are out of date

https://docs.roots.io/acorn/2.x/directory-structure/#wp-cli-commands

working commands:

```sh
$ wp acorn acorn:init
$ wp acorn acorn:init storage
```

need to audit all the commands on this page and make sure they're working as expected

cc @QWp6t @alwaysblank 