Add a troubleshooting entry for no depth related to camera connections

[itsderek23]

From this issue:

So the depth stream not working turned out to be a loose flex cable on the right camera @itsderek23. I have had it slightly pop up a few times now.

I've had a similar issue once with the RPi Compute.

[itsderek23]

Add a photo of the BW1097 board that show the issue, the code error, and the fix.

[Luxonis-Brandon]

Here’s a photo of this:

FFC has been pushed down by a finger when holding the board, which then causes the FFC connector to partially ‘pop out’ and lose electrical/MIPI connection.