Update documentation

[pietermarsman]

Pull request

Patch fix for the breaking change in the Pillow library where mode 8 is changed to L as pointed out by joaquimcampos in #795

Documentation updates: Added FAQ questions and made small spelling, and grammar fixes.

Documentation updates: Added how-to for extracting coordinates, text and font-info

How Has This Been Tested?

Tested with nox

Doctest summary
===============
   14 tests
    0 failures in tests
    0 failures in setup code
    0 failures in cleanup code
build succeeded.

Checklist

• I have read CONTRIBUTING.md.
• I have added a concise human-readable description of the change to CHANGELOG.md.
• I have tested that this fix is effective or that this feature works.
• I have added docstrings to newly created methods and classes.
• I have updated the README.md and the readthedocs documentation. Or verified that this is not necessary.