Assist: procedure on adding the Assist dashboard button (#28254)

* Assist: procedure on adding the Assist dashboard button

* Move task to its own page

* Add explanation why button is even needed

* Rephrase title

source/_includes/asides/voice_navigation.html

@@ -18,6 +18,7 @@
       <li>{% active_link /voice_control/builtin_sentences/ Built-in sentences %}</li>
       <li>{% active_link /voice_control/custom_sentences/ Custom sentences %}</li>
       <li>{% active_link /voice_control/using_tts_in_automation/ Using Piper TTS in automations %}</li>
+      <li>{% active_link /voice_control/start_assist_from_dashboard/ Starting Assist from your dashboard %}</li>
       <li>{% active_link /voice_control/troubleshooting/ Troubleshooting Assist %}</li>
     </ul>
   </div>

source/voice_control/start_assist_from_dashboard.markdown

@@ -0,0 +1,18 @@
+---
+title: "Starting Assist from your dashboard"
+---
+
+If you are using Home Assistant in kiosk mode, for example if you have a tablet mounted on the wall, the Assist icon in the top right corner is not accessible. In this case, use a dashboard button to start Assist.
+
+## To add an Assist button to the dashboard
+
+1. On your dashboard, select **Add card** and select the **Button** card.
+2. Clear the **Entity** field and give the card a name, such as *Assist - listen*.
+3. Select an icon, such as `mdi:account-tie-voice`.
+4. From the **Action** dropdown menu, select **Assist**.
+5. From the **Assist** dropdown menu, select the assistant you want to use, for example **Home Assistant Cloud**.
+   - You can use any assistant you have previously set up.
+   - If you have assistants in different languages, you can add a button for each of these languages.
+6. If you are using Assist with your voice, enable **Start listening**.
+   - If you don't want to use voice but just want to type, you do not need to enable listening. 
+7. **Save** your new button card.