Upgrade: Bump remove-markdown from 0.3.0 to 0.5.0

Bumps [remove-markdown](https://github.com/stiang/remove-markdown) from 0.3.0 to 0.5.0.
- [Release notes](https://github.com/stiang/remove-markdown/releases)
- [Commits](https://github.com/stiang/remove-markdown/commits)

---
updated-dependencies:
- dependency-name: remove-markdown
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Close: #1024

Author: dependabot[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "normalize-path": "^3.0.0",
     "npm-run-all": "^4.1.3",
     "puppeteer": "5.0.0",
-    "remove-markdown": "^0.3.0",
+    "remove-markdown": "^0.5.0",
     "shelljs": "^0.8.3",
     "stylelint": "^13.0.0",
     "sw-precache": "^5.2.1",