This firmware works on both the Seeed Studio XIAO ESP32S3 and the XIAO
ESP32S3 Plus.

The Plus variant has 16MiB of flash (versus 8MiB on the standard board) and
exposes additional GPIO pins (D11-D19).  The flash size is auto-detected and
the extra pins are included in the pin definitions, so the same firmware runs
on both boards.

For more information see the [Seeed Studio XIAO ESP32S3 wiki](https://wiki.seeedstudio.com/xiao_esp32s3_getting_started/).
