Additional step added into the Raspberry Pi imager instructions
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**Describe The Bug:**
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The latest raspberry Pi imager has split out home assistants into a new sub menu and so a new step between 4 & 5 is needed

**To Reproduce:**
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Open Raspberry Pi imager
Select Choose OS
Select Other specific-purpose OS
Issue - Homebridge not showing
You need to select Home assistants and home automation

**Expected behavior:**
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For Homebridge to appear on the drop down

**Logs:**

```
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**Screenshots:**
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![image](https://user-images.githubusercontent.com/3820105/158137926-65ca84c7-1ee3-47b5-a2b7-da4d136872fe.png)


**Environment:**

* **Homebridge Raspberry Pi Image Version**:
* **Node.js Version**: <!-- node -v -->
* **NPM Version**: <!-- npm -v -->
* **Homebridge Version**: <!-- homebridge -V -->
* **Homebridge Config UI X Plugin Version**: <!-- hb-service -v -->

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