Add an edit button to the documentation pages

[nocomplexity]

Thanks for making and maintaining this great FOSS framework!

Is your feature request related to a problem? Please describe.

When I notice a defect on a documentation page, I want to be able to improve it directly.
For example, when URLs are changed or removed, or when the documentation is no longer consistent with the API capabilities.

Describe the solution you'd like

Suggestion is to use the 'use_edit_page_button' as is available in the PyData Sphinx Theme

This will make fixing the documentation easier. It also ensures you receive a single PR per page, which can be easily merged.

Additional context

See Source Buttons

[philippjfr]

@nocomplexity Appreciate your kind words and the suggestion, will implement.