Highlight syntax with tree-sitter?

[aspiwack]

Nowadays, Gatsby's syntax-highlighter plugin has a Tree-sitter plugin (yes, it's a plugin plugin, or at least I choose to believe so).

Considering that Nickel has a Tree-sitter grammar, that, anyway, Nickel is really hard to classify adequately with regexps, and that we have pretty much only Nickel code on this website, I suggest that we try and use this Tree-sitter plugin rather than relying on Prism.