An experiment in lowering docs preview build times. Build times have gotten quite long again (~12 minutes) because we are generating types on code blocks during prerendering. This wastes compute time building a lot of pages on preview branches that never get viewed, and slows down iteration speed.
Instead, let's only prerender on prod, and build on-demand for preview sites.
Limiting to realtime section for now to monitor the effects of changes.
Split guide layouts by section, so that nav data fetches can be pushed down to thesection where they're actually used. Limits blast radius of any data fetch problems, and also lets us push down client components in the future, since layouts now have context on the request path and we don't need a high-level usePathname.
Charis