[docs] demonstrate drupal/recommended-project for Drupal install instead of drupal-project

[rfay]

Describe the bug

Per https://www.drupal.org/docs/develop/using-composer/starting-a-site-using-drupal-composer-project-templates from Drupal 8.8.x forward, there is a composer template in Drupal core, and using drupal-project is no longer the recommended technique

So we'll want to change the D8/D9 quickstart docs to use that instead of drupal-project.

Currently we have
ddev composer create drupal-composer/drupal-project:8.x-dev --stability dev --no-interaction --prefer-dist

And we'll want to change to something like:

ddev composer create drupal/recommended-project:^8.8--stability dev --prefer-dist

And probably also add D9 version...