Use nuxt-shiki for syntax highlighting

[pi0]

Hi. Today I learned (unjs/undocs#45) that there are several places Shiki is being integrated into Nuxt (MDC and UI at least I know) and also maintaining/well-testing shiki with an optimized integration is becoming trickier every day including tree-shaking, configuration, and wasm support PS if someone wants directly use shiki API for code highlighting, they need to again duplicate logics (like un undocs)

I made a quick draft of nuxt-shiki module to make it more standard from one place.

I would love to hear what would be needed / what features are missing to make this happen.

(UI discussion nuxt/ui#1361)

[pi0]

nuxt-shiki should be ready and stable to use but I am no longer interested in tracking this migration feel free to adopt or not.