Rename node types

[wooorm]

Subject of the feature

Rest of unified uses lowercase, suffixless values. RootNode -> root. Would make sense to align them.

Actual behaviour

ParagraphNode

Expected behaviour

paragraph

Alternatives

Keep it as it is, it’s been a while, changing it would lead to a bit of confusion for a while too.

[wooorm]

Closing for now. It isn’t perfect. At some point it can be improved. For now, it might just wrak havoc...