Creating an admin account for new servers outdated

[wiegelmann]

Since v4.2.8 the registration is disabled by default for new servers mastodon/mastodon#29280

The "Creating an admin account" section is outdated, because signing up with the browser is not possible when registration is disabled by default. https://docs.joinmastodon.org/admin/setup/

If the admin creates a new account with tootctl, the Owner account is unapproved by default, meaning the admin needs to run a second tootctl command to approve the Owner account.

RAILS_ENV=production bin/tootctl accounts modify alice --approve