Adjust sphinx documentation to work with github pages

[amias-channer]

Description

To make the most of the sphinx documentation in Dr Header we will need to make a few adjustments to make it work with github pages.

We could also at a github action to do this for us and run it as part of the release process

info here on how to do it : https://daler.github.io/sphinxdoc-test/includeme.html

[amias-channer]

There will be some fun uploading to gh-pages because of PAT code restrictions.

This covers it and provides an example config.
https://stackoverflow.com/questions/57827703/github-actions-no-ci-alternative

[amias-channer]

Some of the documentation includes the old urls from the jamez's github , this ticket will include updating them.

[amias-channer]

this work is in progress in https://github.com/Santandersecurityresearch/DrHeader/tree/auto-build-documentation