Add an easy-to-read HTML report

[mccalluc]

• Fix Easy-to-read HTML report #485

WIP. Needs a spec for the HTML report.

[mccalluc]

Unrelated test failure:

E           playwright._impl._errors.TimeoutError: Locator.click: Timeout 30000ms exceeded.
E           Call log:
E             - waiting for get_by_role("link", name="Download Notebook (.ipynb)")

[mccalluc]

Not sure about the best way to add plotting here.

• just put the data in the HTML, and use D3 or similar to render the chart. Downside is that this chart will look different from the preview.
• Or in shared.py, add a call to https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.savefig.html, and have some kind of global state that is accumulating plots, and then we incorporate them (via data-URIs) into the final html document?

[mccalluc]

Status: With more product types, need to think about how to make sure we're not multiplying the work to create HTML reports for each. Also would like to hear more from the research data repository community: is this something they need?