Add security when registering frontend with encryption/signing

[jrmi]

See:

• https://codeforgeek.com/encrypt-and-decrypt-data-in-node-js/
• https://github.com/chris-rock/node-crypto-examples
• https://github.com/chris-rock/node-crypto-examples

Requirements:

• Easy to use in dev mode
• Easy to use in pipeline
• Allow multiple hostname live on same siteId (ex: For deploy preview for instance)
• Allow same hostname live on multiple siteId (Try on dev then try on prod or have multiple server)

Steps:

1. We register the site via an API and get an api key
2. We crypt "something" with the key to pass a challenge and put in setup ? Or we crypt the setup.py file with the secret key ?
3. When we visit the site, since the browser call an endpoint, the server try to access the referer (or whatever specified in query) and load the setup from it ?

[jrmi]

Done with ricochet