Incorporate dashboards and forecasts into lesswrong/EA Forum.

[NunoSempere]

Previously, Habryka expressed some interest on incorporating dashboards into the EA Forum/Lesswrong. Before doing that, I think it would be nice it to:

• Make the backend for dashboards more robust (the graphql changes should suffice)
  • Separately, dashboards are now being indexed by the hash of the forecasts, rather than by the hash of the forecast-ids. Should be easy to change.
• Make dashboards searchable by name?
• Make it easier to embed questions.
• Deal with the edge-case where forecasts have resolved (possibly fetch resolutions; see Save resolutions #10)
  • Right now, resolved questions simply disappear from dashboards.

I imagine that people embedding individual forecasts would also want to display the history (#28), but that's a separate feature.

[NunoSempere]

For reference: Here is the commit for incorporating OWID charts: ForumMagnum/ForumMagnum@56b4155