Add documentation for Switch as X (#22069)

Co-authored-by: Erik Montnemery <erik@montnemery.com>

source/_integrations/light.switch.markdown

@@ -1,41 +0,0 @@
----
-title: "Light Switch"
-description: "Instructions on how to set up a light switch within Home Assistant."
-ha_category:
-  - Light
-ha_release: 0.83
-ha_iot_class: Local Push
-ha_quality_scale: internal
-ha_domain: light
----
-
-The light switch platform lets you control an existing switch, allowing you
-to use a switch like a light in Home Assistant.
-
-In Home Assistant's world, a wall plug is a switch. This platform allows you
-to expose this switch as a light source, allowing you to add, e.g., the wall
-plug controlling your Christmas Tree, to be part of a light group.
-
-To enable this platform in your installation, add the following to your
-`configuration.yaml` file:
-
-```yaml
-light:
-  - platform: switch
-    name: Christmas Tree Lights
-    entity_id: switch.christmas_tree_lights
-```
-
-{% configuration %}
-  name:
-    description: The name of the light switch.
-    required: false
-    type: string
-    default: Light Switch
-  entity_id:
-    description: "The `entity_id` of a switch entity to control as a light source."
-    required: true
-    type: string
-{% endconfiguration %}
-
-A light switch only supports turning on/off a light.

source/_integrations/switch_as_x.markdown

@@ -0,0 +1,35 @@
+---
+title: "Switch as X"
+description: "Instructions on how to convert any Home Assistant switch into something else."
+ha_category:
+  - Cover
+  - Fan
+  - Light
+  - Lock
+  - Siren
+  - Switch
+ha_release: 2022.4
+ha_iot_class: Local Push
+ha_quality_scale: internal
+ha_domain: switch_as_x
+ha_config_flow: true
+---
+
+The Switch as X integrations lets you convert any Home Assistant switch into
+a Home Assistant Light, Cover, Fan, Lock, or Siren.
+
+In Home Assistant's world, a wall plug is a switch. And while that is correct
+for a wall plug in general, those plugs are often used with e.g, a light
+fixture or a fan. General-purpose relays are similar, as they are sometimes used for
+things like locks or garage doors.
+
+Using the Switch as X integration, you can convert those switches into the
+entity types that best matches your use case.
+
+{% include integrations/config_flow.md %}
+{% configuration_basic %}
+Switch entity:
+  description: The switch entity you want to convert into something else.
+Type:
+  description: The type of entity you want the switch to become.
+{% endconfiguration_basic %}

source/_redirects

@@ -170,6 +170,7 @@
 /integrations/generic_ip_camera /integrations/generic
 /integrations/google /integrations/google_translate
 /integrations/input_slider /integrations/input_number
+/integrations/light.switch /integrations/switch_as_x
 /integrations/openalpr /integrations/openalpr_local
 /integrations/pca /integrations/elv
 /integrations/pollen /integrations/iqvia