Public data sources and styles redesign

I think it'd be really good to redesign the 'public sources' section in data sources modal, linking to docs, pricing, stats, etc... for the different public data sources (Thunderforest, MapTiler, Ordnance Survey)

Current UI

What I personally think would be useful is

- Links to pricing and usage tiers
- Link to docs about the tilesets what features they provide etc...

Questions

- Are there any other details we should provide in the UI?
- Any other thoughts/ideas?

Pinging people at the various tileset providers @gravitystorm, @klokan, @snodnipper

Start with the public sources section in the data sources modal and compare it with the current UI shown in the issue. Review how Thunderforest, MapTiler, and Ordnance Survey are currently presented. Done should provide a settled redesign with links to relevant pricing, usage, documentation, and tileset information, but the issue needs decisions on the scope and additional details first.

Written by the indexing model from the issue text.