Bump sitedown from 3.3.2 to 5.0.1 (#46)

Bumps [sitedown](https://github.com/ungoldman/sitedown) from 3.3.2 to 5.0.1.
- [Release notes](https://github.com/ungoldman/sitedown/releases)
- [Changelog](https://github.com/ungoldman/sitedown/blob/master/CHANGELOG.md)
- [Commits](ungoldman/sitedown@v3.3.2...v5.0.1)

---
updated-dependencies:
- dependency-name: sitedown
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

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

package.json

@@ -15,7 +15,7 @@
     "node-sass": "^7.0.1",
     "npm-run-all": "^3.1.0",
     "postcss-cli": "^2.6.0",
-    "sitedown": "^3.2.0",
+    "sitedown": "^5.0.1",
     "stylelint": "^7.2.0",
     "stylelint-config-standard": "^13.0.0",
     "top-bar.css": "^1.2.0"