feat: reference implementation for Hydra+NextJS

[amorey]

Checklist

• [x] I have read the contributing guidelines and signed the CLA.
• [ ] I have referenced an issue containing the design document if my change introduces a new feature.
• [x] I have read the security policy.
• [x] I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security vulnerability, I confirm that I got green light (please contact security@ory.sh) from the maintainers to push the changes.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] I have added necessary documentation within the code base (if appropriate).

[CLAassistant]

All committers have signed the CLA.

[vinckr]

Thanks so much for these examples @amorey ! I will see to review next week latest 🙌 If you like you can also take a look @kevgo

[kevgo]

To satisfy the Conventional commits check, your commit message body must start with a lowercase character. Renaming this PR to feat: reference implementation for Hydra+NextJS should do it.