Explore "official" pod deprecation

I thought it was widely known and accepted to not use pods for new apps, and it came to my attention that we haven't officially deprecated them because we never officially supported them. So I think we should explore an RFC that makes it clear that we don't support them for new apps going forward.

Some considerations:
1. would need to remove the existing generators
2. would need to remove the flag
3. would need to identify what gaps exist for folks who currently use pods (could they move away from them, what would need to be replaced, etc.
4. would need to remove references in the docs