feat: render list of Q&A and Ideas from GitHub discussions

[marcklingen]

Langfuse continues to centralize Q&A and feature requests on GitHub discussions. It'd be useful to render lists of the latest questions and most upvoted ideas on the respective pages in the docs

We could use SSR or ISR for this

• as we release docs more than once a day, SSR would be enough probably
• ISR makes builds faster and pages less stale