[Feature] Add STL and/or DXF files for RPi mounting brackets

[ChrisWeiss]

The mounting brackets to affix the 5" display to the aluminum faceplate are provided as a PDF. It would be nice to have them as DXF and STL files, as those are easier to machine off of.

[Deftaudio]

Hi Chris, they are in CDR too.
https://github.com/Deftaudio/Midi-boards/blob/master/Eurorack_RPi/Eurorack_RPi_mounting_bracket.CDR