Add documentation for OwnTracks over HTTP (#3460)

* Add documentation for OwnTracks over HTTP

* Unfeature owntracks platform in favor of owntracks_http

source/_components/device_tracker.owntracks.markdown

@@ -9,7 +9,7 @@ sharing: true
 footer: true
 logo: owntracks.png
 ha_category: Presence Detection
-featured: true
+featured: false
 ha_release: 0.7.4
 ---
 

source/_components/device_tracker.owntracks_http.markdown

@@ -0,0 +1,36 @@
+---
+layout: page
+title: "OwnTracks (via HTTP)"
+description: "Instructions how to use Owntracks via HTTP to track devices in Home Assistant."
+date: 2017-09-28 07:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: owntracks.png
+ha_category: Presence Detection
+featured: true
+ha_release: 0.55
+---
+
+OwnTracks is a free and open source application that allows you to track your location in Home Assistant. This is a platform that supports OwnTracks via their HTTP publishing method.
+
+To integrate Owntracks tracking via HTTP in Home Assistant, add the following section to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+device_tracker:
+  - platform: owntracks_http
+```
+
+For configuration options and usage instructions, read the documentation for the [OwnTracks platform](/components/device_tracker.owntracks/).
+
+## {% linkable_title Configuring OwnTracks to submit data via HTTP %}
+
+Open OwnTracks and go to Connection preferences:
+
+ - Mode: Private HTTP
+ - Host: <Home Assistant url>/api/owntracks/<your name>/<device name>
+ - Identification: turn authentication on, username `homeassistant` and password is your API password that you use to login to Home Assistant.
+ 
+Host example: If I host my Home Assistant at `https://example.duckdns.org`, my name is Paulus and my phone is a Pixel I would set the host to be `https://example.duckdns.org/api/owntracks/paulus/pixel`. This will result in an entity with an ID of `device_tracker.paulus_pixel`. You can pick any name for the user and the device.