Add guide per data type

[Zethson]

I think we have to make it as easy as possible for people to understand how to use annbatch for all possible data types.
The paper showed the following use cases:

• Single-cell RNA-seq (Tahoe-100M, ~100M cells)
• Whole-genome sequencing / genetics (1000 Genomes expanded to 500k individuals)
• Single-cell microscopy images (scportrait, 128×128×5)
• Distributed/multi-GPU training

I'd love to have a list of guides in the sidebar that is like: VCF data -> this tutorial; microscopy images -> this tutorial

Would you be open to a contribution of mine @ilan-gold ?

[ilan-gold]

Yes, I’ve also been pondering an alternate (maybe shorter) version where we just have an FAQ (instead of full-blown tutorials). Open to anything though!