Add BoM + BoM Suggestion: 6" HDMI Cable

I've found [this HDMI cord](https://sewelldirect.com/sewell-hdmi-cable-high-speed-with-ethernet-male-to-male-6-inch) to be friendly in tight spaces.  It's short enough that it _may_ affect HDMI signal timings (and thus not work as expected) but I haven't run into this issue myself.
