Add Mozilla Privacy not included to privacy safety precautions

[NatalieZelenka]

• The methodology page: https://foundation.mozilla.org/en/privacynotincluded/about/methodology/ may be useful

[github-actions[bot]]

Thanks for opening an issue! The maintainers of this project are currently away for a few weeks, but we'll see this as soon as we can :)

From the Data Hazards team!

[ninadicara]

I've added this to a new page of tools related to the Data Hazards (I didn't think it made sense as a safety precaution if we're thinking they should be quite general, and it seemed more like a complementary method). This is in PR #169