Code to set the pcv.params.px_height and pcv.params.px_width will consider which chip dim is wider, and assign the wider chip dimension appropriately (since nano chips are 3mm by 4mm where other chips are square).

Adds onto documentation.

Type of update
Is this a:

• feature enhancement
• Work in progress

Associated issues
#1726 mentions that the unequal height and width

Additional context
We might consider adjusting the aspect_ratio setting, unless specified by the user, when 'nano' is selected since the chips are more rectangular than square. We did adjust this setting default (from 1.2 in find_color_card to 1.27 in detect_color_card) to allow for detection of nano cards, although a slightly larger settings might give more robust detection.

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved