Summary:
Depends on D19252. Ref T13105. This very roughly renders Jupyter notebooks.
It's probably better than showing the raw JSON, but not by much.
Test Plan:
- Viewed various notebooks with various cell types, including markdown, code, stdout, stderr, images, HTML, and Javascript.
- HTML and Javascript are not live-fired since they're wildly dangerous.
Maniphest Tasks: T13105
Differential Revision: https://secure.phabricator.com/D19253
