[VOG-331] Implement Synthetic Chart

[vogelino]

Design and implement a synthetic chart for display on the FAQ page and certain info modals.

_VOG-331

[linear]

MIM-73 Implement Synthetic Chart

[davidpomerenke]

synthetic chart [counterfactual chart] only works for average protests, not individual protests

only relevant for the methodology page, not the core pages

and arguably, the impact chart hover effect is already something like a synthetic chart? @kleinlennart @vogelino

[vogelino]

Understood! It's possible we do the synthetic chart as an hover, although I am not sure yet it this is UX-friendly (thinking hovering the hovered thing and if the mouse leaves everything closes, etc.) We need to think this through. But we'll find a way!