feat(docs) Adding a hardware issues page under troubleshooting

[nmunnich]

This PR adds a "hardware issues" page under troubleshooting. It discusses:

• Identifying problems with pins
• Firmware changes needed after soldering a bodge wire
• Common physical problems with antennas
• Advice for troubleshooting the physical problems

In the process, there are also two new shields to help with troubleshooting: tester_pro_micro and tester_xiao. This partially resolves #2410, though I would really like a more general solution eventually.

[nmunnich]

Did a big overhaul of this, updated the title and description accordingly.

[caksoylar]

Oh, I think this needs to be rebased to fix the broken link in build.