wp-now: change the directory displayed in console for playground mode

[sejas]

When running wp-now start on Playground mode, we reference the current directory, but actually, all the files loaded live in the home directory ~/.wp-now/wp-content/plagyround

Example:

> wp-now start
Starting the server......
directory: /Users/user/some-path
mode: playground
php: 8.0
wp: latest
Downloading WordPress latest...
Downloading SQLite...
Server running at http://localhost:8881

I suggest removing the directory or outputting the actual wp-content folder.

We can also consider outputting the wp-content folder in all the cases so the user knows where their files live.