Define a fine-grained Roadmap for Project Shipwright

[qu1queee]

We only have a very generic one.

[qu1queee]

We have a new document https://github.com/shipwright-io/community/blob/main/ROADMAP.md but is not fine grained, moving this one for the community meeting.

[adambkaplan]

@qu1queee Since the "Shipwright Overview" project is now public, can we consider that our "fine-grained" roadmap?