best-practices

Provide the steps to reproduce

1. Run LH on https://output.jsbin.com/vulerujohi for just

Is your feature request related to a problem? Please describe.
We have a file pkg/policy/defaultRules.yaml - which is the source of truth for the default rules in users' policies.
It's very important we don't break it, therefore - better testing is required.
A quick win would be to test and validate the structure of the yaml

Describe the solution you'd like
Add a test file **pkg/pol

What and where?
Please give the broken URL. Where is the link located?

Would you like to be assigned to this issue?
Check the box if you will submit a PR to fix this issue. Please read CONTRIBUTING.md.
-KONG [ ] Assign me, please!

This hint has been around since 2018 and is documented on webhint.io (https://webhint.io/docs/user-guide/hints/hint-doctype/). However it's not enabled by default in any of webhint's configurations (likely an oversight).

We should turn this on by default and perform any necessary cleanup in the process (e.g. switching to get locations from webhint's location-aware DOM that was added after the