Explicitly disclaim compatibility with Python 3.11 in the documentation

[nutjob4life]

🗒️ Summary

Merge this to resolve the documentation updates asked for in #149.

⚙️ Test Data and/or Report

Running Sphinx v4.2.0
loading translations [en]... done
[autosummary] generating autosummary for: development/index.rst, index.rst, installation/index.rst, support/index.rst, usage/index.rst
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 5 source files that are out of date
updating environment: [new config] 5 added, 0 changed, 0 removed
reading sources... [100%] usage/index                                                                                   
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] usage/index                                                                                    
generating indices... genindex done
writing additional pages... search done
copying images... [100%] _static/images/fs-vs-registry.png                                                              
copying static files... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded.

♻️ Related Issues

• 149