According to the docs in
https://httpd.apache.org/docs/current/rewrite/flags.html#flag_l using
[L] in an .htaccess context incurs the risk of infinite recursion,
which is exactly what we were seeing in production for non-existing
.php files. Use [END] instead.

Update the WP Multisite section according to
https://wordpress.org/support/article/htaccess/#wordpress-3-5-and-up

Merges the contents of ai3/docker/noblogs (composer branch).