Update Nitrokey internal link

Signed-off-by: redoomed1 <161974310+redoomed1@users.noreply.github.com>

docs/basics/email-security.md

@@ -33,7 +33,7 @@ Email providers which allow you to use standard access protocols like IMAP and S
 
 ### How Do I Protect My Private Keys?
 
-A smartcard (such as a [YubiKey](https://support.yubico.com/hc/articles/360013790259-Using-Your-YubiKey-with-OpenPGP) or [Nitrokey](../multi-factor-authentication.md#nitrokey)) works by receiving an encrypted email message from a device (phone, tablet, computer, etc.) running an email/webmail client. The message is then decrypted by the smartcard and the decrypted content is sent back to the device.
+A smartcard (such as a [YubiKey](https://support.yubico.com/hc/articles/360013790259-Using-Your-YubiKey-with-OpenPGP) or [Nitrokey](../security-keys.md#nitrokey)) works by receiving an encrypted email message from a device (phone, tablet, computer, etc.) running an email/webmail client. The message is then decrypted by the smartcard and the decrypted content is sent back to the device.
 
 It is advantageous for the decryption to occur on the smartcard to avoid possibly exposing your private key to a compromised device.