Removed all the old things specific to the Sink and its programming jig.
Removed (I think) all references to the PD Buddy Sink, replacing them
with PD Buddy Dev.  Reorganized repository for just one KiCad project.

No need to provide our own anymore now that they're all merged upstream.

That library is getting less important though, thankfully.  Still, while
it has symbols we need, it should be accessible.

In preparation for adding a second board (the programming jig) to this
repository, I've moved the PD Buddy Sink files to their own directory.

Set the _KI_LIB_GIT path to point to a local copy of the kicad-library
Git repository.  Then this project will pick up the Git libraries
instead of the system ones.

That's the name they should have, since the board hasn't been called PD
Buddy since v0.1.

Tested to probably not blow anything up if assembled properly!