Improve design-time benchmark visualisation

[vedran-kasalica]

The improvement is inspired by Workflomics/pubmetric#48 and user feedback. Proposed improvements:

• Include citation count for the last 5 years
• Group benchmarks (OS, bibliometric, etc.)

[vedran-kasalica]

The benchmarks were grouped, but it would be nice to implement the recent citation count as well at some point. This should not be too complicated.