Add webpack config for building prod

[jtpio]

trafficstars

Follow the JupyterLab config: https://github.com/jupyterlab/jupyterlab/blob/main/dev_mode/webpack.prod.config.js

To check:

• https://github.com/jupyterlab/jupyterlab/pull/9776

Fixes #7373 Fixes https://github.com/jupyter/notebook/issues/7221

[github-actions[bot]]

:point_left: Launch a Binder on branch jtpio/notebook/webpack-prod

[jtpio]

This may also be related to the following issues:

• https://github.com/jupyter/notebook/issues/6080
• https://github.com/jupyter/notebook/issues/5963

[jtpio]

Postponing to 7.3.0, as this likely involves using the html-webpack-plugin to properly inject the script tag with the cache busting hash string. We might also want to take the opportunity to restructure the build so each page has its own app and bundle, similar to the approach taken in JupyterLite:

• https://github.com/jupyterlite/jupyterlite/tree/main/app/tree
• https://github.com/jupyterlite/jupyterlite/tree/main/app/consoles
• https://github.com/jupyterlite/jupyterlite/tree/main/app/notebooks

Instead of the current approach which currently builds a single bundle, and activate a specific list of plugins on each page.