Improve home page chapters map

[arkid15r]

Describe the solution you'd like
We want all chapters to be shown on the map (in case user wants to explore more) but the default zoom should be on the local/nearest user chapters.

I'm not sure about this feature request feasibility so this requires a bit of research first. We have geo ranking via Algolia index and could use the N nearest chapters to figure out the coordinates for narrowing down the default zoom. All chapters coordinates are available via graphQL and from index too.

[Naveen-Pal]

interested to contribute