Rework "common troubleshooting steps"

This page: https://support.audacityteam.org/troubleshooting/common-troubleshooting-steps
doesn't work at the moment.

* The steps it lists generally don't seem to work
* The steps listed are very specific to audio devices (and not common)
* The page is one of the most viewed and one of the lowest rated pages we have

It is unclear how to exactly salvage this page.

Start by reviewing the common troubleshooting steps page linked in the issue, along with its view and rating context. Identify which steps fail, which content is specific to audio devices, and what broader audience the page should serve. Done means agreeing on a salvageable scope and producing a revised page whose steps work and are genuinely common.

Written by the indexing model from the issue text.