[Bug]: HTML repr does not display well in notebooks hosted on GitHub

[shoyer]

What happened?

We see both the raw text and a malformed version of the HTML (without CSS formatting).

Example (https://github.com/microsoft/PlanetaryComputerExamples/blob/main/quickstarts/reading-zarr-data.ipynb):

What did you expect to happen?

Either:

1. Ideally, we only see the HTML repr, with CSS formatting applied.
2. Or, if that isn't possible, we should figure out how to only show the raw text.

nbviewer gets this right:

Minimal Complete Verifiable Example

No response

Relevant log output

No response

Anything else we need to know?

No response

Environment

NA