🔧 Update packaging to create unbundled modules

[rowanc1]

This improves the packaging export to allow for tree-shaking in down stream packages. Bundles are at the top,

• [x] unpkg
• [x] local html (browser)
• [x] tests
• [x] typescript
• [x] jest
• [x] rollup
• [x] update all packages to latest

Downstream testing:

• [x] mystjs
• [x] vscode
• [x] jupyter-myst

The new dist folder looks like:

[rowanc1]

@chrisjsewell this is good to go!

Have rebased and tested downstream packages (shouldn't be any changes).

The references updates look good in vscode. :)