Update how settings.php gets appended

[aOelschlager]

For issue #401

This removes the update-settings make command from the starter variants and replaces the default_settings.txt in the starter site. This is how the isle site template does it's configuration.

To test run make starter_dev or make starter.

[aOelschlager]

Make starter_dev works but make starter errors out.

[alxp]

Confirm that make starter_dev works for me.

make starter seems to fail on Drupal install looking for the database, but I was able to immediately docker compose exec mariadb with-contenv bash and run mysql and see the database was created. Running make starter again continues the build. So I don't think the error is related to the problem addressed in this PR>

[aOelschlager]

That fixed the error on make starter. This works but it's still calling the update-settings make command during make hydrate. If I remove that command from make hydrate then make starter and make starter_dev white screen on adding repository objects or media. I think it has to do with the fedora url not being set. I should have that fixed here soon.

[aOelschlager]

This is ready for review now.

[alxp]

Just tested make starter and make starter_dev and they both worked.