Using Screen on Raspberry Pi Without CircuitPython Image

To get this screen working on a Raspberry Pi Zero 2 W _without_ having to use a [CircuitPython image](https://circuitpython.org/board/raspberrypi_zero2w/), I needed the following Python dependencies:

```
adafruit-blinka-displayio
adafruit-circuitpython-display-text
adafruit-circuitpython-ssd1327
RPi.GPIO
```

I've opened this issue for others that may be struggling to do the same thing because I couldn't find instructions anywhere.

The issue lists the Python dependencies needed for an SSD1327 screen on a Raspberry Pi Zero 2 W without a CircuitPython image, but names no documentation file or test. Start by locating the project's existing setup instructions, then document these dependencies and verify that the instructions cover the described configuration.

Written by the indexing model from the issue text.