YAML over JSON

[rnbguy]

I understand the need of JSON. But the chain information are maintained manually.

Probably better if we use YAML (or something similar as TOML) for readability and compile and serve them as JSON.

[jackzampolin]

Prefer json fwiw

[hxrts]

I'd like to use this, which would also let us remove the schema https://ipld.io/docs/codecs/known/dag-json/