Expand test to cover all documents the nodejs/node lints

[nschonni]

Currently the CI test only covers the docs, but there are a few additional directories that the main repo checks https://github.com/nodejs/node/blob/5f80df882057522c38c30b99f4bf25d82c68f662/Makefile#L1196-L1200
The current remark-lint way of ignoring globs might not work, so a test script or some && calls might be required

[XhmikosR]

Just please remember Windows too. I personally use shx in npm scripts for cross-platform commands.

If you make a PR feel free to ping me.