Improve projects empty state and clarify the differences between projects and workspaces

[gtsiolis]

Problem to solve

Users can be confused about projects and workspaces, as well as how they correlate.

The new project page still mentions the workspaces per project split, which has been removed.

Projects allow you to manage prebuilds and workspaces for your repository.

While the existing relevant docs about Teams & Projects differences are clearer, there's still some confusion around Workspaces & Projects.

See relevant discussion (internal).

Proposal

TBD (To be discussed)

In the meantime, things we could improve include:

1. Consider updating the Projects empty state.
2. Link to the project when there's an associated project from the workspaces list #5125
3. Epic: Improve dashboard navigation #8385
4. ...

[stale]

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