Merge atomic-algolia and algolia-indexing into `atomic-indexing` package

[chrisdmacrae]

I'm looking to rewrite atomic-algolia in December, to add better intellisense, type safety, and such.

At that time, I want to add the advanced feature sets of algolia-indexing, but also make it generic to any search provider that follows a custom index strategy like Algolia.

My initial plan is to support both Algolia and Meilisearch, by abstracting the interface for communicating with the remote throughout the code, and pushing the algolia/meilisearch logic to the edges of the program.

My thought is that this could be called atomic-indexing, and atomic-algolia and algolia-indexing could just be aliases to this project going forward.