Add help linking to jsonschema/rjsf docs for JSON editor fields

[n1k0]

• [ ] Link to jsonschema website for the collection schema JSON editor (even better if we find some online JSON schema builder, maybe the formbuilder?)
• [ ] Link to uiSchema documentation for the collection uiSchema JSON editor

[Natim]

I am :+1: for a link to the formbuilder. It could even open in a popup with a button Save Schema that will populate the admin properties page in a second time?