Add support for Algolia JSON indices

[NightMachinery]

I already have Algolia indices built for my site. If I could just plug those into stork, I could try it out with little friction. This will help the adoption of the project. It also reduces lock-in.

PS: Here is my Algolia index file, if you haven't seen the format.

[jameslittle230]

Thanks for submitting the feature request, @NightMachinary! I want to set expectations properly - this isn't something I'm interested in building myself, but if someone submits a PR for this I'd be more than willing to help get it merged.