Describe the issue linked to the documentation

At the bottom of the "Building the documentation" section there is a warning about the best performing sphinx version, which leads to this file, supposedly mirroring the configuration on CircleCI.

In the file, the suggested version is sphinx=6.0.0. However, sphinx=7.0.0 is the minimum necessary to make the current package combination work. If the version is reverted back to sphinx=6.0.0, the following error will appear: sphinx-prompt 1.8.0 requires Sphinx<8.0.0,>=7.0.0, but you have sphinx 6.0.0 which is incompatible.

Suggest a potential alternative/fix

Replace sphinx=6.0.0 with sphinx=7.0.0.