Mapping for nullbits tidbit board with bit-c pro

[patricksurry]

Split from #915 after review by board owner. cc @jaygreco

[patricksurry]

the contribution guidelines lint make fix-isort fix-formatting test makes changes to a bunch of other files I haven't touched. but it also doesn't seem to match GHA which complained about double-quoted doc string after lint passes?

I can add the lint changes to the other files here if that's helpful, just lmk

[xs5871]

GHA runs make lint for linting. The fix-* targets are for mostly automatic fixing of lint errors and are meant to be run manually before a commit. The lint and fix targets run different tools and have slightly different code coverage for some historical reason... There can sometimes be differences, this time it's something on your side though. Maybe your master branch or your tooling is out of date.