Finalize out-of-the-box setup with features for common use-cases

[fubhy]

• Routing (Drupal-backed and custom)
• Lazy components
• Service Workers
• Pre-loading during SSR
• Route transition / loading indicator
• Authentication flow
• Multilingual
• Persisted queries (without having to build and commit them)
• Get rid of introspection.json
• Make it look pretty
• Add a few more pages that actually make sense
• Add content editing capabilities (mutations)