change the FIDO2 NPO doc + added to the NPO index

source/components/nitrokeys/features/fido2/nitrophone.rst

@@ -4,33 +4,13 @@ FIDO2 on Android / NitroPhone
 .. Note::
     For more information about FIDO2, FIDO2 U2F and Passkeys, check our `blog article  <https://www.nitrokey.com/blog/2022/fido2-webauthn-passkeys-2022-and-2023>`_.
 
-In order to use FIDO2 on GrapheneOS you need to install the Google Play services via GrapheneOS App Store.
 
-.. Note::
-    You don't have to grant Play services the network permission in order for FIDO2 to work.
-
-.. important::
-   Play services do not support PIN functionality over NFC.
-
-Multi-Factor Authentication With FIDO2, FIDO U2F
-################################################
-
-Registration and sign-in works seamlessly with USB and NFC, in Vanadium and in apps. No further steps are required.
-
-FIDO2 Passkeys
-##############
-
-**If no third-party autofill service is enabled:**
-
-Signing in with passkeys and Vanadium should work without having to change any settings.
-
-**If a third-party autofill service is enabled:**
+In order to use passkeys being stored on a Nitrokey with your NitroPhone we recommend using the open source app `Authnkey  <https://f-droid.org/en/packages/pl.lebihan.authnkey/>`_. Alternatively you could use Google Play Services.
 
-Disable Vanadium's support for passkeys with password managers by changing an experimental setting:
+Once Authnkey is installed on your NitroPhone you will need to launch it and set it as the default passkey provider with the "Enable" button and switch Authnkey as your preferred service. When this is done your NitroPhone will be ready to use your Nitrokey and FIDO2. Both NFC and USB connectivity works. You can test this with `WebAuthn.io  <https://webauthn.io/>`_.
 
-1. In the address bar, type: ``chrome://flags`` and press enter.
-2. In the search bar, type "passkeys".
-3. A setting called "Android Credential Management for passkeys" will appear. Change this setting to "Disabled".
-4. Select "Relaunch".
+Authnkey also comes with useful features such as:
 
-In order to test if FIDO2 works on your Android / NitroPhone you can use `WebAuthn.io  <https://webauthn.io/>`_.
+- Show the Nitrokey status with its attributes.
+- List saved credentials.
+- Change the FIDO2 PIN.

source/components/nitrophone/index.rst

@@ -24,4 +24,4 @@ For more details, see the following pages:
    Background Images <background-images>
    Frequently Asked Questions <faq>
    Headwind MDM (HMDM) <hmdm/index>
-
+   FIDO2 on Android / NitroPhone <../nitrokeys/features/fido2/nitrophone>