Tailwind features meta issue

- [x] let's make the site more responsive
- https://tailwindcss.com/docs/responsive-design/
- [ ] dark mode
- https://tailwindcss.com/docs/breakpoints/#dark-mode
- https://github.com/tailwindlabs/tailwindcss/pull/2279
- ~https://github.com/ChanceArthur/tailwindcss-dark-mode~
- ~https://github.com/innocenzi/tailwindcss-theming~
- [ ] animations
- https://tailwindcss.com/docs/animation/
- mostly for icons in buttons
- [x] gradients
- https://github.com/tailwindlabs/tailwindcss/pull/2176
- https://github.com/tailwindlabs/tailwindcss/releases/tag/v1.7.0#new-background-clip-utilities
- ~https://github.com/lorisleiva/tailwindcss-plugins/tree/master/gradients~
- we have gradients but they're inlined CSS, not Tailwind classes
- [ ] typography/fonts
- https://github.com/tailwindlabs/tailwindcss-typography
- https://tailwindcss.com/docs/font-family
- we have custom (not really custom, it's from Google Fonts) font families but they're inlined CSS, not Tailwind classes
- [x] skew (for the SVGs in the Why? section on landing), also scale on hover?
- https://tailwindcss.com/docs/skew
- [ ] micro-optimization: use a different TailwindCSS production build for each page instead of using a single build for all pages so that pages don't load unnecessary CSS
- super unimportant but would be interesting to implement; our Tailwind build is already small
- https://github.com/beyondcode/tailwind-jit-api (probably can't directly use the API b/c CORS)