Remove Domain expiry documentation (#5345)

source/_components/sensor.domain_expiry.markdown

@@ -1,37 +0,0 @@
----
-layout: page
-title: "Domain Expiry"
-description: "Instructions on how to set up Domain expiry sensors within Home Assistant."
-date: 2018-04-24 14:14
-sidebar: true
-comments: false
-sharing: true
-footer: true
-logo: home-assistant.png
-ha_category: System Monitor
-ha_release: 0.69
-ha_iot_class: "depends"
----
-
-The `domain_expiry` sensor gets whois information about domain and displays the expiry in days. 
-
-To add the Domain Expiry sensor to your installation, add these options to `configuration.yaml` file:
-
-```yaml
-# Example configuration.yaml entry
-sensor:
-  - platform: domain_expiry
-    domain: home-assistant.io
-```
-
-{% configuration %}
-domain:
-  description:  Domain name to track
-  required: true
-  type: string
-name: 
-  description: The friendly name for the certificate.
-  required: false
-  type: string
-  default: Domain Expiry
-{% endconfiguration %}