Break repo into individual designs

[jonnew]

The repo, as of writing this issue, needs to be divided into 4 repos. The first is the control board and firmware

1. commutator-controller
   • Control board schematic, PCB, assembly materials
   • Firmware

The additional three are complete designs with (1) included as submodule:

1. commutator-spi
2. commutator-coax
3. commutator-coax-dual

[cjsha]

Sure. We decided this will be the last step in Revision D milestone. Two questions:

• Should we preserve git history of each of the new four repos? https://docs.github.com/en/get-started/using-git/splitting-a-subfolder-out-into-a-new-repository Or should each new repo get a fresh git history?
• Should we archive this repo? Iirc, once archived, you can't rename an archived repo so we should consider renaming and then archiving.

Depending on which fiber-coax rotary joint we go with, I suggest calling it "commutator-dual" instead of "commutator-coax-dual" if it accommodates both the fiber-coax rotary joint and coax-coax rotary joint.

[cjsha]

https://github.com/open-ephys/commutator-dual
https://github.com/open-ephys/commutator-spi
https://github.com/open-ephys/commutator-coax
https://github.com/open-ephys/commutator-controller

They are still private github repos - I just wanna double-check that the licensing, READMEs, how organized teensy designs vs rp2040 designs (i.e. rev c & before vs rev d & after), etc. are ok.

[jonnew]

Looks good. I can review when I get in, then we can deprecate this one and make public.

We need to update the docs links too, right?