Update layout.njk

Update README.md

Bumps [nunjucks](https://github.com/mozilla/nunjucks) from 3.0.1 to 3.2.4.
- [Release notes](https://github.com/mozilla/nunjucks/releases)
- [Changelog](https://github.com/mozilla/nunjucks/blob/master/CHANGELOG.md)
- [Commits](mozilla/nunjucks@v3.0.1...v3.2.4)

---
updated-dependencies:
- dependency-name: nunjucks
  dependency-type: direct:production
...

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Bumps [semver](https://github.com/npm/node-semver) from 5.5.0 to 5.7.2.
- [Release notes](https://github.com/npm/node-semver/releases)
- [Changelog](https://github.com/npm/node-semver/blob/v5.7.2/CHANGELOG.md)
- [Commits](npm/node-semver@v5.5.0...v5.7.2)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: indirect
...

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Bumps [brace-expansion](https://github.com/juliangruber/brace-expansion) from 1.1.11 to 1.1.12.
- [Release notes](https://github.com/juliangruber/brace-expansion/releases)
- [Commits](juliangruber/brace-expansion@1.1.11...v1.1.12)

---
updated-dependencies:
- dependency-name: brace-expansion
  dependency-version: 1.1.12
  dependency-type: indirect
...

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Bumps [marked](https://github.com/markedjs/marked) to 9.1.6 and updates ancestor dependency [gulp-markdown](https://github.com/sindresorhus/gulp-markdown). These dependencies need to be updated together.


Updates `marked` from 0.3.19 to 9.1.6
- [Release notes](https://github.com/markedjs/marked/releases)
- [Changelog](https://github.com/markedjs/marked/blob/master/.releaserc.json)
- [Commits](markedjs/marked@v0.3.19...v9.1.6)

Updates `gulp-markdown` from 2.0.1 to 8.0.0
- [Release notes](https://github.com/sindresorhus/gulp-markdown/releases)
- [Commits](sindresorhus/gulp-markdown@v2.0.1...v8.0.0)

---
updated-dependencies:
- dependency-name: marked
  dependency-version: 9.1.6
  dependency-type: indirect
- dependency-name: gulp-markdown
  dependency-version: 8.0.0
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [nunjucks](https://github.com/mozilla/nunjucks) to 3.2.4 and updates ancestor dependency [gulp-nunjucks](https://github.com/sindresorhus/gulp-nunjucks). These dependencies need to be updated together.


Updates `nunjucks` from 2.5.2 to 3.2.4
- [Release notes](https://github.com/mozilla/nunjucks/releases)
- [Changelog](https://github.com/mozilla/nunjucks/blob/master/CHANGELOG.md)
- [Commits](mozilla/nunjucks@v2.5.2...v3.2.4)

Updates `gulp-nunjucks` from 2.3.0 to 6.0.0
- [Release notes](https://github.com/sindresorhus/gulp-nunjucks/releases)
- [Commits](sindresorhus/gulp-nunjucks@v2.3.0...v6.0.0)

---
updated-dependencies:
- dependency-name: nunjucks
  dependency-version: 3.2.4
  dependency-type: indirect
- dependency-name: gulp-nunjucks
  dependency-version: 6.0.0
  dependency-type: direct:production
...

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