Fix display of complex (yet correctly marked up) blockquotes
Tweak styling of lists within tables
Only show the back to top link if we have enough vertical space
White space
Add :active navigation styles
Previous > Previously
Remove data-href.js, replace with absolutely positioned link.

data-href.js cause problems with middle- and right- mouse clicks.
Themeatically style prev/next labels
Comment out theme styles for years 2014-2020

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