ref: update /code/[id] to use server-side rendering

[ItzDerock]

also fixes syntax highlighting and adds some caching

[diced]

In the /code/[id] file most places where there should be semicolons and trailing commas are not there, could you add these in and it should be ready to merge.

[diced]

To fix the build it might help to check if the ZIPLINE_DOCKER_BUILD environment variable is present and return nothing, then dynamically import lib/datasource after the condition.

[diced]

Was included in the latest commit, closing.