Produce UF2 file for releases rather than the bin files

[jeff-winn]

For deployments to devices, having all of the arduino tools installed, ensuring all the dependencies are being installed can be quite cumbersome for someone just wanting to use the product. The feather products come with a bootloader that accepts UF2 files to aid deployment by dragging and dropping the files onto the device using the USB cable without any additional software.

As a user, this would greatly increase adoptability for ease of deployment.

Here's a couple helpful links I found:

• https://github.com/microsoft/uf2/blob/master/utils/uf2conv.md
• https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51/uf2-bootloader-details
• Could you provide how you made .UF2 files for your example projects? Seeed-Studio/Seeed_Arduino_USBDISP#7

[jeff-winn]

The following link contains the documentation to generate custom uf2 files for deployment to the nRF52 feather hardware:
https://github.com/adafruit/Adafruit_nRF52_Bootloader

[jeff-winn]

The outputs were successfully deployed to the devices during testing of the changes prior to merging the code.