Layout Changes

Updating header and body structure
Update responsive styling

[#42065365]
Updates to general style elements to coexist with new responsive layout.
Merge branch 'mt/1.0' of github.com:koansys/koansys_sphinx_theme into mt/1.0

Conflicts:
	koansys/layout.html
	koansys/static/images/kdoc_banner.png
	koansys/static/koansys.css_t
	koansys/static/koansys.less