Should ARC_APP_SECRET also be mentioned under Deployment in the docs?

[fzembow]

It's my first time using Architect, and I've really enjoyed Remix! Really excited about this combo.

When following the getting started guide, in the Deployment section

⚠️ Warning: The environment variable "ARC_APP_SECRET" is not set - please set this in production to help mitigate potential session-related attacks!

Looking at the Architect docs on security, it definitely seems important to set.

Perhaps

npx arc env --add --env production ARC_APP_SECRET $(openssl rand -hex 32)

Should be added to the docs above the other production secret being set? I can make a quick PR if that makes sense.

[kentcdodds]

Cc @tbeseda sound good?

[tbeseda]

@fzembow @kentcdodds Yep, good call. I think both staging and production should have this set.