create github pages for schema releases

[satra]

use a github workflow to create an html page.

use the json schema viewer app and the json-ld playground to point people to releases.

[yarikoptic]

yep, would be nice. Additional potential helper/visualizer

https://github.com/FAIRsharing/JSONschema-documenter

https://fairsharing.github.io/JSONschema-documenter/?schema_url=https://raw.githubusercontent.com/dandi/schema/master/releases/0.6.9/asset.json#

github pages or not, we could also just equip with README.md's in each folder with corresponding URLs to all of them. So just a matter of a little helper to invoke to generate them