quickstart build fails

## Description

Following the instructions in the README -- after cloning I run: `npm run quickstart`.
Part way through the build process, it exits with the following error:

```
Running Sphinx v4.5.0
making output directory... done
myst v0.15.2: MdParserConfig(renderer='sphinx', commonmark_only=False, enable_extensions=['dollarmath'], dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', disable_syntax=[], url_schemes=['http', 'https', 'mailto', 'ftp'], heading_anchors=3, heading_slug_func=None, html_meta=[], footnote_transition=True, substitutions=[], sub_delimiters=['{', '}'], words_per_minute=200)
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 3 source files that are out of date
updating environment: [new config] 3 added, 0 changed, 0 removed
reading sources... [100%] index
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... failed

Warning, treated as error:
unsupported theme option 'pygment_light_style' given
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 2.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
```

## Reproduce

1. `git clone https://github.com/jupyterlite/pyodide-kernel`
2. `cd pyodide-kernel`
3. `npm run quickstart`

## Expected behavior

The build to complete fully.

## Context

- pyodide-kernel version: 0.0.6
- Operating System and version: macos 12.6
- Browser and version: n/a