add simple url handling

[nickshine]

• www.example.com/about should redirect to www.example.com/about/ with trailing slash redirects option.
• www.example.com/about/ should retrieve www.example.com/about/index.html object from an s3 backend origin with simple urls enabled.

[github-actions]

🎉 This issue has been resolved in version 0.3.0 🎉

The release is available on GitHub release

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