Add http_cache_control module

This stuff can mostly be done in .htaccess:

https://developers.google.com/web/tools/lighthouse/audits/cache-policy
>
but the direction to use cached version instead of taking the error,
available in dev and 2.0 beta branches currently, may be useful with Cloudflare

composer.json

@@ -27,6 +27,7 @@
         "drupal/google_analytics": "^2.3",
         "drupal/honeypot": "^1.29",
         "drupal/hotjar": "^1.2",
+        "drupal/http_cache_control": "^1.0",
         "drupal/http_client_error_status": "^1.0",
         "drupal/indieweb": "1.x-dev",
         "drupal/mailsystem": "^4.3",