Config flow documentation for html5 (#31805)

* html5: Config flow documentation

* Add config flow link

* Tiny tweak

---------

Co-authored-by: alexyao2015 <alexyao2015@users.noreply.github.com>
Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/html5.markdown

@@ -4,6 +4,7 @@ description: Instructions on how to use the HTML5 push notifications platform fr
 ha_category:
   - Notifications
 ha_release: 0.27
+ha_config_flow: true
 ha_iot_class: Cloud Push
 ha_domain: html5
 ha_platforms:
@@ -20,35 +21,6 @@ The `html5` notification {% term integration %} enables you to receive push noti
 HTML5 push notifications **do not** work on iOS versions below 16.4.
 {% endimportant %}
 
-## Configuration
-
-To enable this platform, add the following lines to your {% term "`configuration.yaml`" %} file.
-{% include integrations/restart_ha_after_config_inclusion.md %}
-
-```yaml
-# Example configuration.yaml entry
-notify:
-  - platform: html5
-    vapid_pub_key: YOUR_PUBLIC_KEY
-    vapid_prv_key: YOUR_PRIVATE_KEY
-    vapid_email: YOUR_EMAIL
-```
-
-{% configuration %}
-vapid_pub_key:
-  description: The VAPID public key generated by Google (this is the key that is immediately visible under "webpush certificates"), [see configuring the platform](#configuring-the-platform).
-  required: true
-  type: string
-vapid_prv_key:
-  description: The VAPID private key generated by Google, [see configuring the platform](#configuring-the-platform).
-  required: true
-  type: string
-vapid_email:
-  description: The email account of your Google account associated with your Firebase project, [see configuring the platform](#configuring-the-platform).
-  required: true
-  type: string
-{% endconfiguration %}
-
 ### Requirements
 
 The `html5` platform can only function if all of the following requirements are met:
@@ -60,15 +32,8 @@ The `html5` platform can only function if all of the following requirements are
 - You have configured SSL/TLS for your Home Assistant. It doesn't need to be configured in Home Assistant though, e.g., you can be running NGINX in front of Home Assistant and this will still work. The certificate must be trustworthy (i.e., not self-signed).
 - You are willing to accept the notification permission in your browser.
 
-### Configuring the platform
 
-1. Create a new project at [https://console.cloud.google.com/home/dashboard](https://console.cloud.google.com/home/dashboard), this project will be imported into Firebase later (alternatively, the project can also be created in the next step).
+{% include integrations/config_flow.md %}
-2. Go to [https://console.firebase.google.com](https://console.firebase.google.com), and click the "Add project" button
-3. Choose your Google Cloud project for the name field (or create a new one). Decline analytics.
-4. Then, click the cogwheel on top left and select "Project settings".
-5. Select the "Cloud Messaging" tab.
-6. Generate a new key pair in "Web configuration" at the bottom of the page. Add the public key as `vapid_pub_key` in the config, then choose the 3 dots, and copy the private key for `vapid_prv_key` in the config.
-7. Input your Google email as `vapid_email` in the config.
 
 ### Setting up your browser