Consider collapsing summary and description properties into just description for certain node types

[rsek]

Collections and oracles have both. Originally, summary was for the short text and description was for longer text.

This is intended to hint the expected text size to developers, but since both properties are optional, in practice people just do something like const foo = node.summary ?? node.description. Longer descriptions from the book also have implications re: licensing.

I think it'd be better to just use description, but at the length currently used by summary.