Add row of primary features

[joshmoore]

see: https://mmistakes.github.io/minimal-mistakes/docs/helpers/#feature-row

[sanketverma1704]

Hi @joshmoore.
What features do you want to see in the row?

[joshmoore]

I don't know 😸 From Zarr - OnePager.pdf, I imagine:

• chunked, compressed n-dimensional arrays
• cloud storage & concurrent acccess
• annotated hierarchies

would be an ok start, but obviously, more is possible.