package.json has been updated to specify the minimum Node.js version

we require (>= 14.0.0), to avoid any confusing errors when building

static media.
The .babelrc file has been renamed to babel.config.json. This is the

modern filename, and some tools expect it, skipping .babelrc. We also

have the option to make this babel.config.js in the future, letting us

make the file more dynamic, if needed.
We also now define the dedent and django-gettext plugins, which

weren't previously enabled for Rollup-based JavaScript bundles. These

dependencies are provided by @beanbag/frontend-buildkit.

Erased node_modules and re-created it with setup.py develop, which

worked.
Built a package successfully.
Checked various parts of the website (datagrids, admin UI, My Account,

review request pages) without any errors.