Bundle

[samestep]

To help more accurately assess efforts like #37, this PR adds a new private @rose-lang/site package that uses Vite to bundle for the browser, so we can see how big that bundle is (both with and without gzip) by looking at Vite's build output:

yarn workspace @rose-lang/site build
yarn workspace v1.22.19
yarn run v1.22.19
$ vite build
vite v4.3.9 building for production...
✓ 14 modules transformed.
dist/index.html                  0.33 kB │ gzip:  0.24 kB
dist/assets/index-09f82714.js  227.93 kB │ gzip: 79.93 kB
✓ built in 186ms
✨  Done in 0.40s.
✨  Done in 0.54s.

I initially tried just using library mode instead of wrapping it in a webpage, but because of vitejs/vite#4454, that prevents us from seeing the benefits of better asset handling like #39. This is fine anyways though, because we'll want to have a site eventually.

I copied some of the tsconfig.json changes from commit cc3560d in #9, then pulled most of it out into a new tsconfig.json file at the package root that we can share among all our packages.