Upgrade markdown-it (and plugins) to ESM (with CJS fallbacks) (#237)

* Bump eslint from 8.54.0 to 8.56.0 (#2)

Bumps [eslint](https://github.com/eslint/eslint) from 8.54.0 to 8.56.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/main/CHANGELOG.md)
- [Commits](eslint/eslint@v8.54.0...v8.56.0)

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* Bump @babel/preset-env from 7.23.3 to 7.23.6 (#5)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.23.3 to 7.23.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.23.6/packages/babel-preset-env)

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* Bump eslint-plugin-import from 2.29.0 to 2.29.1 (#7)

Bumps [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import) from 2.29.0 to 2.29.1.
- [Release notes](https://github.com/import-js/eslint-plugin-import/releases)
- [Changelog](https://github.com/import-js/eslint-plugin-import/blob/main/CHANGELOG.md)
- [Commits](import-js/eslint-plugin-import@v2.29.0...v2.29.1)

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* Bump markdown-it-footnote from 3.0.3 to 4.0.0 (#1)

Bumps [markdown-it-footnote](https://github.com/markdown-it/markdown-it-footnote) from 3.0.3 to 4.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-footnote/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-footnote@3.0.3...4.0.0)

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* Bump markdown-it-sup from 1.0.0 to 2.0.0 (#3)

Bumps [markdown-it-sup](https://github.com/markdown-it/markdown-it-sup) from 1.0.0 to 2.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-sup/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-sup@1.0.0...2.0.0)

---
updated-dependencies:
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* Bump markdown-it-sub from 1.0.0 to 2.0.0 (#4)

Bumps [markdown-it-sub](https://github.com/markdown-it/markdown-it-sub) from 1.0.0 to 2.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-sub/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-sub@1.0.0...2.0.0)

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updated-dependencies:
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* Bump isomorphic-dompurify from 1.9.0 to 1.12.0 (#10)

Bumps [isomorphic-dompurify](https://github.com/kkomelin/isomorphic-dompurify) from 1.9.0 to 1.12.0.
- [Release notes](https://github.com/kkomelin/isomorphic-dompurify/releases)
- [Commits](kkomelin/isomorphic-dompurify@v1.9.0...v1.12.0)

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* Bump @babel/core from 7.23.3 to 7.23.6 (#9)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.23.3 to 7.23.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.23.6/packages/babel-core)

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* Bump markdown-it-container from 3.0.0 to 4.0.0 (#12)

Bumps [markdown-it-container](https://github.com/markdown-it/markdown-it-container) from 3.0.0 to 4.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-container/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-container@3.0.0...4.0.0)

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* Bump @twemoji/api from 14.1.2 to 15.0.3 (#13)

Bumps [@twemoji/api](https://github.com/jdecked/twemoji) from 14.1.2 to 15.0.3.
- [Release notes](https://github.com/jdecked/twemoji/releases)
- [Commits](jdecked/twemoji@v14.1.2...v15.0.3)

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  update-type: version-update:semver-major
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* Bump markdown-it-emoji from 2.0.2 to 3.0.0 (#8)

* Bump markdown-it-emoji from 2.0.2 to 3.0.0

Bumps [markdown-it-emoji](https://github.com/markdown-it/markdown-it-emoji) from 2.0.2 to 3.0.0.
- [Changelog](https://github.com/markdown-it/markdown-it-emoji/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it-emoji@2.0.2...3.0.0)

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updated-dependencies:
- dependency-name: markdown-it-emoji
  dependency-type: direct:production
  update-type: version-update:semver-major
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* update imports

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* Bump jsdom from 23.0.0 to 23.0.1 (#14)

Bumps [jsdom](https://github.com/jsdom/jsdom) from 23.0.0 to 23.0.1.
- [Release notes](https://github.com/jsdom/jsdom/releases)
- [Changelog](https://github.com/jsdom/jsdom/blob/main/Changelog.md)
- [Commits](jsdom/jsdom@23.0.0...23.0.1)

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- dependency-name: jsdom
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* Fix linter errors

* Upgrade markdown-it from 13.0.1 to 14.0.0 (#15)

markdown-it 14.0.0 is now ESM (with a CJS fallback) and fixes some bugs with `img` alt text strings.
https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md#1400---2023-12-08

* Bump isomorphic-dompurify from 1.12.0 to 2.0.0 (#16)

Bumps [isomorphic-dompurify](https://github.com/kkomelin/isomorphic-dompurify) from 1.12.0 to 2.0.0.
- [Release notes](https://github.com/kkomelin/isomorphic-dompurify/releases)
- [Commits](kkomelin/isomorphic-dompurify@v1.12.0...v2.0.0)

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* Bump @babel/preset-env from 7.23.6 to 7.23.7 (#17)

Bumps [@babel/preset-env](https://github.com/babel/babel/tree/HEAD/packages/babel-preset-env) from 7.23.6 to 7.23.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.23.7/packages/babel-preset-env)

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* Bump @babel/core from 7.23.6 to 7.23.7 (#19)

Bumps [@babel/core](https://github.com/babel/babel/tree/HEAD/packages/babel-core) from 7.23.6 to 7.23.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.23.7/packages/babel-core)

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* Bump @babel/register from 7.22.15 to 7.23.7 (#18)

Bumps [@babel/register](https://github.com/babel/babel/tree/HEAD/packages/babel-register) from 7.22.15 to 7.23.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.23.7/packages/babel-register)

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* Bump chai from 4.3.10 to 5.0.0 (#20)

* Bump chai from 4.3.10 to 5.0.0

Bumps [chai](https://github.com/chaijs/chai) from 4.3.10 to 5.0.0.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](chaijs/chai@v4.3.10...v5.0.0)

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* Upgrade test config to ESM
- change `helper.js` to `helper.mjs`.
- `use` no longer mutates a global `chai` object, which changes how spies are set up.

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