[Defer] CLI: Create directives

[zaydek]

Would be really nice if we can do:

• retro create component --page
• retro create context
• retro create hook

[zaydek]

We might need to disambiguate retro create x from retro create page x. Maybe we should rename create or simply remove it in favor of npx create-retro-app. This is somewhat harmful though because it would also be nice to just have Retro as a global CLI tool and not rely on create x tools.

So then we need something like: retro new x and retro create page x. Or maybe we do retro create app x and retro create page x. That seems to be the most comfortable.

The other use case is supporting templates like --language=js, etc.

[zaydek]

Deferring this for 0.2 or 0.3, etc.

[zaydek]

This seems out of scope for now since we’ve extracted create-retro-app. Maybe will revisit later.