Typography generally

[jamiemccue]

Suggestions for cleaning up the typography:

make the h1 dark grey or black (discuss if necessary)

• [x] make h3-h6 headings larger and black (or blue) (these headings are too small and getting lost in the visual hierarchy)

• [x] reduce margin-bottom on first ordered lists

• [x] increase margin below code blocks

[justinbmeyer]

Make sure codepen and diff looks ok when playing with margins

[justinbmeyer]

We should create a style guide page