Add table of contents toggle for low-width devices #314
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This adds a button to show / hide the TOC column on low-width devices.
It also adjusts various styles to keep the top bar fixed as you scroll so that the TOC toggle button remains accessible anywhere in the document. Flexbox is used in the low-width nav bars to improve vertical centering.
The appearance on high-width devices is unchanged. No TOC button is shown there.
toggle-toc.mov
Fixes #313
Also fixes #305