utility.hmac: Label "hmac_creation" as deprecated...This function is coupled to "wqflask.app", therefore requiring it's
import at the module level. This may lead circular importation issues
when working with blueprints.
Add some documentation for generating heatmaps...Issue:
https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/non-clustered-heatmaps-and-flipping.gmi
* Add some documentation on generating the heatmaps, that would be
useful for the end user.