drop dependency on katex

[mk]

There's a dependency on katex which shows up in Clerk's js bundle.

Would be nice if we could drop this or make it optional, as Clerk isn't using it for display (but loading it dynamically). I tried dropping it in nextjournal/clerk@0303e73 but that lets SSR fail.

[rainbow-bamboo]

Update: As of March 2024, there are a 4 reported and patched moderate vulnerabilities in Katex focused on normalizing URLs and escaping filenames. They have been patched as of 0.16.10 , but the jump from the 0.12 version used to the patched version is listed as a breaking change.