Remove the proxy container [ci skip]

As there's only one domain for this project, using http://localhost will
fine.

web/sites/default/settings.docker.php

@@ -12,5 +12,5 @@ $databases['default']['default'] = [
 ];
 
 $settings['trusted_host_patterns'] = [
-  '^oliverdavies.localhost$',
+  '^localhost$',
 ];