Escalated from discussion #3661

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I've spent a bit of time considering a re-working from scratch, but perhaps we should start with some simple iterative improvements to the default theme?...

• The current coloring is just too loud. Here's a more muted darkslateblue, without the unnecessary gradiant gloss.
• Drop the previous and next controls from the nav bar.
• Drop the text from the search/repo/color mode.

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• Less verbose search modal.

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• Bring transparency to the table of contents.