Refine publish geospatial Zarr data guide

https://github.com/ipfs/ipfs-docs/pull/2243 added a new guide on [publishing geospatial Zarr data](https://bafybeich2qc7dny4vhqow65i6uql2eyclgvddqlu7vtivt7xmxmqswzt5y.ipfs.inbrowser.link/how-to/scientific-data/publish-geospatial-zarr-data/)

Some additional refinements for a followup:
- [ ] Add more links from docs landing pages
- [ ] Address feedback from @vmx:
> In the MFS section you introduce "HALO flight datasets". I think it would be good if you could introduce them right here at the beginning and then make all steps working with that dataset, so one can follow along locally.
> When I started to look into Zarr, I had a hard time figuring out what it exactly looked like on disk. Most resources I found where online notebooks. So such a start to finish walk through with actual data would've been useful. E.g. it would've been clearer to me that a "somedata.zarr" is actually a directory and not a single file.