Include project proposals on the "projects" page

When open project proposals exist, they should be displayed on the Eclipse SDV's "projects" page.

My recommendation is that we wrap them with text to provide context. I can help write this text (assuming we all think that this is a good idea.

Only proposals that are in the "community review" state should be displayed.

If there are no proposals in this state, we should display nothing.

@sgallian @mplagge @bbaldassari2kd @dennisl @scorbett