Add mrcal and camera inspection docs

[mcm001]

No description provided.

[mdurrani808]

Theres a warning on calibration.rst saying that calibration takes a long time at high resolution, does this still home with mrcal? is it more performant

[mcm001]

It should be faster, but not instant. Pi 4 should be much better than 3, and 5 or a opi5 should blow it out of the water. But it's still worth mentioning that it may take a couple seconds I think?

Also. Someone should try a big chunky (30+ image) dataset on a pi 4 or 5 with mrcal, so we have real numbers

[mdurrani808]

Gotcha lets keep the warning then. One small thing, can you move calibration steps so that calibration tips is the first subsection under tips, and swap calibration w/ PV and calib db.
Small note, you state "Let’s now cd into the calibration folder we created using calibrationUtils.py above" but you should name the section since the investigation section isn't a subsection of the one above it so it doesnt flow well. Otherwise solid.