Fix dead links

[friadev]

Changes proposed in this PR:

• Remove some dead links

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[dngray]

So it looks like Joplin added support for biometrics for both iOS and Android in the same commit, it does appear also they've done away with their changelog page, guess they're using github releases like us now too.

As for Matrix's encryption, I changed that to a more relevant page.

[privacyguides-bot]

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

https://discuss.privacyguides.net/t/v3-19/16257/1