Remove deprecated Piglow integration (#21803)

source/_integrations/piglow.markdown

@@ -1,31 +0,0 @@
----
-title: Piglow
-description: Instructions on how to setup Piglow LED's within Home Assistant.
-ha_category:
-  - DIY
-ha_release: 0.37
-ha_iot_class: Local Polling
-ha_domain: piglow
-ha_platforms:
-  - light
----
-
-<div class='note warning'>
-
-This integration is deprecated and will be removed in Home Assistant Core 2022.4.
-
-For more information see: [Architectural Decision Record 0019](https://github.com/home-assistant/architecture/blob/master/adr/0019-GPIO.md).
-
-</div>
-
-The `piglow` platform lets you control the [Piglow](https://shop.pimoroni.com/products/piglow) lights on your Raspberry Pi from within Home Assistant.
-
-## Configuration
-
-To add piglow to your installation, add the following to your `configuration.yaml` file:
-
-```yaml
-# Example configuration.yaml entry
-light:
-  - platform: piglow
-```

source/_redirects

@@ -444,7 +444,6 @@
 /components/light.niko_home_control /integrations/niko_home_control
 /components/light.opple /integrations/opple
 /components/light.osramlightify /integrations/osramlightify
-/components/light.piglow /integrations/piglow
 /components/light.plum_lightpad /integrations/plum_lightpad
 /components/light.qwikswitch /integrations/qwikswitch
 /components/light.rpi_gpio_pwm /integrations/rpi_gpio_pwm
@@ -1621,7 +1620,6 @@
 /components/philips_js /integrations/philips_js
 /components/pi_hole /integrations/pi_hole
 /components/picotts /integrations/picotts
-/components/piglow /integrations/piglow
 /components/pilight /integrations/pilight
 /components/ping /integrations/ping
 /components/pioneer /integrations/pioneer
@@ -2367,3 +2365,6 @@
 /integrations/bme280 /more-info/removed-integration 301
 /components/orangepi_gpio /more-info/removed-integration 301
 /integrations/orangepi_gpio /more-info/removed-integration 301
+/components/light.piglow /more-info/removed-integration 301
+/components/piglow /more-info/removed-integration 301
+/integrations/piglow /more-info/removed-integration 301