[Epic] Tracking and Optimization

Tasks

[x] structured data and rich results [1.5d] - https://github.com/datahq/frontend/issues/301
[x] Sitelinks (or sublinks) [0.5d]
- https://github.com/datahq/frontend/issues/297
- check awesome pages if we can implement something similar
[x] work on next top 10 datasets [1d] - https://github.com/datahq/frontend/issues/302
[x] Showcase page interactions [1d] - https://github.com/datahq/frontend/issues/295
[x] track events on server-side - https://github.com/datahq/frontend/issues/300