Remove old pm docs

source/_components/sensor.particulate_matter.markdown

@@ -1,35 +0,0 @@
----
-layout: page
-title: "Particulate matter Sensor"
-description: "Instructions how to integrate Particulate matter (PM) sensors within Home Assistant."
-date: 2015-08-09 12:00
-sidebar: true
-comments: false
-sharing: true
-footer: true
-logo: mqtt.png
-ha_category: Sensor
-ha_release: 0.26
-ha_iot_class: "Local Push"
----
-
-
-The `serial_pm` sensor platform allows you to use your Particulate matter (PM) sensors with Home Assistant.
-
-To use your PM sensor in your installation, add the following to your `configuration.yaml` file:
-
-```yaml
-# Example configuration.yml entry
-sensor:
-  platform: serial_pm
-  serial_device: /dev/tty.SLAB_USBtoUART
-  name: Nova
-  brand: novafitness
-```
-
-Configuration variables:
-
-- **serial_device** (*Required*): The port where the sensor is connected.
-- **name** (*Optional*): The name of the sensor. 
-- **brand** (*Required*): The type or brand of the sensor.
-