Mention "Atlas of Surveillance" in the "Mass Surveillance" section

[Kefaku]

Added a mention of the Atlas of Surveillance to the Mass Surveillance section, since that might be a useful/interesting resource for some people.

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[privacyguides-bot]

This pull request has been mentioned on Privacy Guides. There might be relevant details there:

https://discuss.privacyguides.net/t/v2-31/11698/1