Display comparison overview in comparison page

[florianschwanz]

Add a mobility overview containing

• [x] a radar chart diagram
• [x] a list of stations and lines in reach
• [x] a sentence about the percentage of streets nearby that are suitable for bikes

for each selected place to the comparison page as sketched in the Figma prototype based on the results of

• Implement REST endpoint that provides mobility index
• Implement REST endpoint that provides nearby streets that are suitable for bikes.