DOC: explain how mamba2 and micromamba2 differ

[lucascolley]

Reading the mamba 2.0 changes page in the docs, I understand the general sentiment that mamba and micromamba have become more similar to each other. I also understand from other docs pages that they are still different in that they can be installed differently.

Aside from that, how do they differ? Why might I choose to use one over the other?

[henryiii]

I'm assuming they are exactly identical, just one is statically linked and the other dynamically linked in Homebrew/homebrew-core#195371. Could be wrong, though, based that on the changelog: https://mamba.readthedocs.io/en/latest/developer_zone/changes-2.0.html