Embed API reference docs in docs.deno.com/api/

[donjo]

Issue to capture the work necessary to embed the content that is rendered via https://api-reference.deno.dev/api/deno/ into the API reference section of docs.deno.com/api

{ Placeholder to update with a task list once technical approach is established }

Example:

[rbetts]

Need to decide: how to host this beside docusaurus. Server the /api route separately and reproduce the header. To start - consider brute-force replicating the header.