Improve documentation and example configurations

Merge branch 'client_credentials_password'

Add support for certificate credential authentication using JWT asser…

…tions (#247)

Make sure token `expires_in` values are integers

Closes #237

Import `certifi` certificates when packaged using pyinstaller

Fix security issue with renewing expired tokens

See: GHSA-9wgg-m99q-hhfc

Improve ordering of PyPI links

Bump version for release; fix license display on PyPI

Merge branch 'main' into issue-183

Configuration documentation refinements