Add documentation for Lightwave lights and switches (#7600)

* Added documentation for Lightwave platform, light and switch.

* Update documentation to match changes in configuration.

* Remove configuration details from switch and light. Update timestamp.

* Updates after review.

* Change ``` to ` where required.

* Removed unnecessary documentation.

* Revert file delete and remove repeated paragraph.

source/_components/light.lightwave.markdown

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+---
+layout: page
+title: "Lightwave Light"
+description: "Instructions on how to integrate Lightwave lights with Home Assistant."
+date: 2018-12-05 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: lightwave.png
+ha_category: Light
+ha_release: 0.84
+ha_iot_class: "Assumed State"
+---
+The `lightwave` light platform integrates your Lightwave lights into Home Assistant.
+<p class='note'>
+Configuration details for the Lightwave platform can be found on the main [Lightwave component](/components/lightwave/) page.
+</p>

source/_components/lightwave.markdown

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+---
+layout: page
+title: "Lightwave"
+description: "Instructions on how to integrate Lightwave devices with Home Assistant."
+date: 2018-12-03 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: lightwave.png
+ha_category: Hub
+ha_release: 0.84
+ha_iot_class: "Assumed State"
+---
+The `lightwave` component links Home Assistant with your Lightwave WiFi link for controlling Lightwave lights and switches. 
+This component uses the official API published by Lightwave on their website [https://api.lightwaverf.com/](https://api.lightwaverf.com/).
+To add your Lightwave devices into your Home Assistant installation, add the following to your `configuration.yaml` file:
+```yaml
+# Example configuration.yaml entry
+lightwave:
+  host: 192.168.1.2
+  lights:
+    R1D3:
+      name: Wall lights
+    R1D4:
+      name: Ceiling lights
+  switches:
+    R1D2:
+      name: Tree socket
+    R2D1:
+      name: Radio socket
+    R2D2:
+      name: Light socket
+    R2D3:
+      name: Phone socket
+    R2D4:
+      name: Torch socket
+```
+
+Where `192.168.1.2` is the ip address of your Lightwave hub.
+Each `switch` or `light` requires an `id` and a `name`. The `id` takes the form `R#D#` where `R#` is the room number and `D#` is the device number.
+
+`lights` and `switches` are optional but one of these must be present.
+
+The first use of a light or switch will try to register with your Lightwave WiFi Link hub. If the hub has not been registered a message on your hub will be displayed asking you to pair the device. You have 12 seconds to push the button on your hub to accept this. Once done, you should be able to control your lights and switches via Home Assistant. This only needs to be done if the hub has not been registered.
+
+The Lightwave Home Assistant component currently supports the following Lightwave devices:
+- Lightwave lights
+- Lightwave switches

source/_components/switch.lightwave.markdown

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+---
+layout: page
+title: "Lightwave Switch"
+description: "Instructions on how to integrate Lightwave Switches with Home Assistant."
+date: 2018-12-05 18:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: lightwave.png
+ha_category: Switch
+ha_release: 0.84
+ha_iot_class: "Assumed State"
+---
+The `lightwave` switch platform integrates your Lightwave switches into Home Assistant.
+<p class='note'>
+Configuration details for the Lightwave platform can be found on the main [Lightwave component](/components/lightwave/) page.
+</p>