Consider rebasing cards on full-functional pages

[roll]

Overview

Currently, there is a mechanism for generating similar content using CardsPlugin. It works mostly OK (click on countries) - https://covid-tracker.frictionlessdata.io/pages/countries.html - but there are some downsides:

• it requires to be supported by all the plugins because we can't rely on document.addEventListener("DOMContentLoaded" inside cards
• it might be confusing regarding navigation perception
• it can't be indexed by the search engines (which is probably the most important)

Once #106 is implemented we can rebase cards on being full-functional pages.