Base font size and utility classes

[nummi]

• Tailwind uses normalize.css, we should too
• Set html font-size to 62.5% so 1rem == ~10px; makes rem sizes easier to grok
• I'll start using the new font-size utility classes in another PR

I've done a lot of clicking around and I don't see any visible changes to the text.

[RobbieTheWagner]

Looks awesome! Thanks for continuing to champion this work 😃. It does appear we have at least one failing test. Might need to slightly tweak some numbers to get that passing. Looks like changing 213 to 212 should be sufficient in the test.

[nummi]

Looks like changing 213 to 212 should be sufficient in the test

I have no idea what is happening...