Fix detector attribute in EBSD signals from NORDIF calibration patter reader

[hakonanes]

Description of the change

This PR makes sure the EBSD.detector attribute in signals returned from the NORDIF calibration pattern reader is an EBSDDetector with the correct shape and not just a dictionary to create a detector with, as is the case in 0.6.1. It is a minor bug, so I consider it unnecessary to make a patch release.

Other things:

• Fix some links in the documentation
• Silence warnings raised in orix after 0.10.1 was released which relates to deprecations there
• Try to make the weekly (Monday) check of the notebooks pass with nbval

Progress of the PR

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

Minimal example of the bug fix or new feature

>>> import kikuchipy as kp
>>> s = kp.load("Setting.txt")

# Before

>>> s.detector
{'shape': (60, 60), 'sample_tilt': 70.0, 'tilt': 0.0, 'azimuthal': 0.0}

# Now

>>> s.detector
EBSDDetector (60, 60), px_size 1 um, binning 1, tilt 0.0, azimuthal 0.0, pc (0.5, 0.5, 0.5)

For reviewers

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