Make layout more accessible for small viewports

[calumryan]

• Includes changes to handle the layout better for different users with access needs.
• Add "back to top" link at the end of content with Javacript to handle visibility on page scroll.
• Changed fixed position navigation and footer to only on tall viewports.
• Remove height on main element so that the content isn't overlapped.

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[calumryan]

@lookupdaily yes regarding having the menu fixed position then now it should only be for screens that are both wide and tall. I've added the combined breakpoints for this now.