Remove dispatcher docs (#10872)

* Remove dispatcher docs. Ref #10491 and #6579

* Remove image.

* Revert "Remove image."

This reverts commit c9de0b4dd85db0c320dabeeeaa2406a977589bde.

source/_integrations/dispatcher.markdown

@@ -1,45 +0,0 @@
----
-title: "Dispatcher IP Camera"
-description: "Instructions on how to integrate internal dispatcher cameras within Home Assistant."
-ha_category:
-  - Camera
-logo: camcorder.png
-ha_release: "0.40"
-ha_iot_class: Configurable
----
-
-<div class='note'>
-This platform is meant for developers only.
-</div>
-
-The `dispatcher` camera platform allows developers to create virtual camera's.
-
-## Configuration
-
-You would normally not add this camera to your configuration directly but have it be discovered by one of the integrations that uses it.
-
-```yaml
-# Example configuration.yaml entry
-camera:
-  - platform: dispatcher
-    signal: name_of_dispatcher_signal
-```
-
-To update the image from another piece of code, run this from an async context:
-
-```python
-from homeassistant.helpers.dispatcher import async_dispatcher_send
-
-async_dispatcher_send(hass, 'name_of_dispatcher_signal', image_data)
-```
-
-{% configuration %}
-signal:
-  description: The signal name of dispatcher signal they send image data to this camera.
-  required: true
-  type: string
-name:
-  description: This parameter allows you to override the name of your camera.
-  required: false
-  type: string
-{% endconfiguration %}