WEB: Update list of maintainers and improve inactive maintainers format
- Adding @lithomas1 and @mzeitlin11 to the maintainers list in the website (sorry it wasn't done when you were promoted)
- Moving @shoyer, @chris-b1 and @toobaz to inactive, renaming the section "Inactive maintainers", and using the same logic to display the names with links as we have for active maintainers

Thanks @datapythonista 