Remove incorrect information about Tutanota

[jonaharagon]

"Tutanota planning to support AutoCrypt" doesn't even make sense if they're not PGP-based, where did we get this information? Also: tutao/tutanota#198 (comment)

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[dngray]

I was sure I removed that bit of information, as it didn't seem accurate. Anyway doesn't seem to be a direction they are going in any time soon.

[privacyguides-bot]

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

https://discuss.privacyguides.net/t/v2-33/11842/1