Jr/june23 html cleanup

[nojronatron]

• [x] Fixup header hierarchy for accessibility.
• [x] Cleanup overall HTML layout and alignment.
• [x] Implement high contrast palette.
• [x] Implement UI queues so user can identify cursor position and active/inactive fields.
• [x] Enable responsive layout using most compatible APIs for phone-sized and desktop-sized viewports.

This is a follow-on to PR #36 .

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