TRMNL Sensor Stand

If you're experimenting with adding sensors via [Terminus](https://github.com/usetrmnl/terminus) to your [TRMNL site](https://trmnl.com) device, this stand holds two of the [1" square sensors from Sparkfun](https://www.sparkfun.com/sensors.html?sf_global_form_factor=5803). This pairs well with the [Raspberry Pi 5 case design](https://www.thingiverse.com/thing:7319921) as both are meant to go together.