feat: added a guide for the passkey integrations (#2362)

* feat: added a guide for the passkey integrations work needed for mobile passkeys. Also tackled a bit of the web passkeys as well.

* chore: format

* fix: broke out of mdx code block and didn't close tab items

* chore: format

* fix: Apply suggestions from code review to fix format

Co-authored-by: Jonas Hungershausen <jonas.hungershausen@ory.sh>

* chore: format

* chore: Apply suggestions from code review for style

Co-authored-by: Vincent <vincent@ory.sh>

* chore: format

* fix: add to sidebar

* fix: changed the language around the apple-app-site-association and assetlink.json to be explicit about RP ID being the recommended host for these files.

* chore: format

* chore: fix build

* chore: fix build

---------

Co-authored-by: Jonas Hungershausen <jonas.hungershausen@ory.sh>
Co-authored-by: Vincent <vincent@ory.sh>
Co-authored-by: Deepak Prabhakara <deepak.prabhakara@ory.sh>

Author: 4 people

docs/kratos/emails-sms/05_custom-email-templates.mdx

@@ -63,7 +63,7 @@ To learn more about the verification flow, read
 When you enable the one-time code method the login flow will need to send out an email to users signing in through the one-time
 code method. The system will then use the `login_code.valid` template to send the login code to the user.
 
-To learn more about login via a one-time code, read the [one-time code](../passwordless/06_code.mdx) documentation.
+To learn more about login via a one-time code, read the [one-time code](../passwordless/07_code.mdx) documentation.
 
 ```mdx-code-block
 </TabItem>
@@ -74,7 +74,7 @@ To learn more about login via a one-time code, read the [one-time code](../passw
 When you enable the one-time code method the registration flow will need to send out an email to users signing up using the
 one-time code method. The system will then use the `registration_code.valid` template to send the registration code to the user.
 
-To learn more about registration via a one-time code, read the [one-time code](../passwordless/06_code.mdx) documentation.
+To learn more about registration via a one-time code, read the [one-time code](../passwordless/07_code.mdx) documentation.
 
 ```mdx-code-block
 </TabItem>

docs/kratos/passwordless/05_passkeys.mdx

@@ -148,6 +148,18 @@ is defined, the passkey strategy will not work.
 }
 ```
 
+### Implementing passkeys in your application
+
+After configuring passkeys, you need to integrate them into your application. The implementation differs depending on your
+platform:
+
+- Web applications can use Ory's `webauthn.js` helper script or manually integrate the WebAuthn API.
+- Mobile applications (iOS and Android) require platform-specific credential management APIs and direct integration with Ory's
+  JSON API endpoints.
+
+For detailed implementation instructions, code examples, and best practices for both web and mobile platforms, see
+[Implementing passkeys for web and mobile](./06_passkeys-mobile.mdx).
+
 ## Passkeys with the WebAuthN strategy
 
 ### Configuration