Add description of how to navigate RGBA images to the kikuchipy documentation

[AndreasBugten]

Description of the change

In the kikuchipy documentation it is not described how one can navigate in RGBA images. The description can be added to the "Any image" part in the tutorial "Visualizing patterns" (https://kikuchipy.org/en/stable/tutorials/visualizing_patterns.html#Any-image).

Progress of the PR

• Docstrings for all functions
• Unit tests with pytest for all lines
• Clean code style by running black via pre-commit

For reviewers

• The PR title is short, concise, and will make sense 1 year later.
• [N/A] New functions are imported in corresponding __init__.py.
• [N/A] New features, API changes, and deprecations are mentioned in the unreleased
  section in CHANGELOG.rst.
• New contributors are added to release.py, .zenodo.json and
  .all-contributorsrc with the table regenerated.

[hakonanes]

Thanks for this suggestion, @AndreasBugten. Can you remove the test.txt file and add the suggestion to the appropriate part of the relevant tutorial: https://github.com/pyxem/kikuchipy/blob/develop/doc/tutorials/visualizing_patterns.ipynb?

[hakonanes]

The change looks good, @AndreasBugten! https://kikuchipy--653.org.readthedocs.build/en/653/tutorials/visualizing_patterns.html#Any-image

To clarify that the two new maps come from two different plotting commands, I'll split the cells into two after CrystalMap.plot() is called.

I'll also add you as a contributor. Is it OK if I add NTNU as your affiliation and your ORCID, like this?

kikuchipy/.zenodo.json

Lines 4 to 6 in 3e0c8c0

	"name": "Håkon Wiik Ånes",
	"orcid": "0000-0002-1213-2911",
	"affiliation": "Norwegian University of Science and Technology"

[AndreasBugten]

That is ok, @hakonanes! Thank you very much.

[hakonanes]

Andreas V. Bugten or just Andreas Bugten?

[AndreasBugten]

Andreas V. Bugten is good. Thank you.

[hakonanes]

Thank you for your first contribution to kikuchipy, @AndreasBugten! I'm hoping for more...