Add to the docs: Case design for "ideaspark® ESP32 Development Board with 0.96 Inch OLED Display"

[fkroepfl]

For your information:

There is another case design for ideaspark® ESP32 Development Board with 0.96 Inch OLED Display available.

• https://www.printables.com/model/773441-esp32-oled-box

It may make sense to include this information in the TiltBridge hardware documentation:

• https://tiltbridge.readthedocs.io/en/master/hardware.html#oled-cases

[thorrak]

This has now been added, and will show in the next docs build after #246 gets merged.