index menstrual cycle example
switch to Libertine fonts for everything
miscellaneous edits
pngcrush some plots
pngcrush the logo
explain that p values crop up elsewhere
make section headings larger and black
move conclusion quote to the beginning
fix a bunch of LaTeX bugs:

- don't indent the rules around admonition boxes
- properly honor memoir margin settings, which sphinx.sty overwrote
- move packages to sphinxbook.cls instead of conf.py