Update htaccess with newest defaults

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

docker/htaccess

@@ -73,6 +73,8 @@ RewriteRule ^(.*) "/wp-content/cache/supercache/%{HTTP_HOST}/%{HTTP:X-Forwarded-
 RewriteCond %{REQUEST_FILENAME} -f [OR]
 RewriteCond %{REQUEST_FILENAME} -d
 RewriteRule ^ - [L]
+RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
+RewriteRule ^(.*\.php)$ $1 [L]
 RewriteRule . index.php [L]
 # END WordPress