PDF fixes

[trevorcampbell]

Also closes #339

Intro:

• fixed fake running cell (uses two {code-cell} blocks now, one with hidden output, one with hidden input and a print stmt)
• shortened section title to fit on one line
• removed extra newline in code block
• manual todo: layout of table 1 in chapter intro

Reading:

• fixed fake running cells

Wrangling:

• fixed fake running cells
• manual todo: images too small

Viz:

• manual todo: viz mouse hover image too big
• manual todo: the histogram bin sizing image too tall
• removed some unnecessary whitespace in an eqn to avoid an ugly linewrap

Cls1:

• centered figures
• handled pdf vs html build for 3d figs
• manual todo: resize 3d fig

Cls2:

• manual todo: figs too small (fig 1)
• manual todo: fix the randomness/seeds code/output environments

Reg1:

• manual todo: under/overfitting figure too big (fig 7)
• handled pdf vs html build for 3d figs
• manual todo: resize 3d fig

Reg2:

• handled pdf vs html build for 3d figs
• manual todo: resize 3d fig

Clustering:

• manual todo: clustering unlucky iteration figure too tall (fig 10)

Inference:

• no changes necessary

Jupyter:

• changed ▸ to unicode for play (because PDF doesn't work with these anyway, may as well use proper unicode play/ffwd symbols in HTML and manually fix in PDF)
• manual todo: change ⼵ to \faPlay, change ⏭ to faFastForward, and add \usepackage{fontawesome}

Version Control:

• no changes necessary

Setup:

• used {code-cell} blocks with :tags: ["remove-output"] for non-running code (better PDF formatting...)

All:

• fixed some bib entries
• manual todo: remove empty references subsections
• manual todo: format the frontmatter (add * for chapters, parts, and acks subsec)
• manual todo: format the author list (use \and)
• manual todo: URLs don't print as footnotes. So all the hyperlink URLs don't actually work in print. E.g. the additional resources section in the reading chapter.

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