Render MD chunks before evaling js

### What I Did

Here's a sample notebook, the report view should show "not working" but the "run full notebook" should show "autorun works": https://alpha.iodide.io/notebooks/2753/?viewMode=report

### What I Expected

The "Run Full Notebook" and "Report view" should produce the same output

### What Happened

From what I see, it's maybe because the HTML didn't load before the JS is executed, maybe I should wait on "onload" before querying the DOM

### (if applicable) notebook that reproduces bug

https://alpha.iodide.io/notebooks/2753/?viewMode=report

Reproduce the issue with notebook 2753 in Report view, then compare its output with Run Full Notebook. Trace the Markdown rendering and JavaScript evaluation order; done means both modes produce the same output, including “not working” versus “autorun works”.

Written by the indexing model from the issue text.