This introduces the sphinx-tabs (https://sphinx-tabs.readthedocs.io/)

extension to our docs, which allows us to separate out blocks of content

into named tabs. Those tabs can be kept in sync across different tab

sets.
This allows us to easily put The Ubuntu/etc. and RHEL/etc. steps under

their own tabs, simplifying the page content when a person is going

through our steps. When they select a tab for an OS, all other steps

will be updated to show the same tab.
Tab functionality will help as we modernize our installation process for

modern distros.

Read through the docs in both HTML and JSON (for website dosc UI) builds.