Provide popularity-related information

[timhoffm]

Provide popularity-related information for the projects, e.g.

• github stars
• PyPI installs

Format and content t.b.d.

This should help users to see whether the project is something substantial or rather a small side-project.

[jklymak]

We had this originally, and its relatively easy to add, but the table formatting was hard (for me).

[timhoffm]

Yes, the available width is somewhat small for additional information. I suggest whether we can remove the (unused) side bars and use that space as well.