- Pin lit to version 2.8.0 (to fix a breakage caused by new
release).
- Update viewer filament version to latest
- Use symbolic link instead of having two copies of the same
file. (Could we consider removing `filament-viewer.js` in
`web/filament-js/` ?)
- Update `web/filament-js/README.md`
This will allow folks to drop a GLB into the following page to get a
WebGL preview. It always uses the latest version of Filament via unpkg.
https://google.github.io/filament/viewer
After the next release we can also use the `<filament-viewer>` component
itself from unpkg and remove the local copy.
