More info for "Red (flashing)"

Previously the only meaningful advice for a flashing red LED was to contact Purism. This change provides a little more info that allows a customer to do some basic troubleshooting before contacting Purism.

@joao.azevedo since this mentions support does this read good to you?

@guido.gunther looks good to me.

@guido.gunther was I supposed to be the one to press the merge button here?

That's one thing i can handle for you. Thanks!

mentioned in commit 37821e96

merged