Remove Webpack plugins from development dependencies to simplify the package.json file

[joaopalmeiro]

Hi! 👋

Problem

This is not exactly a problem, but I would like to suggest a small change to the package.json file to simplify it.

Currently, there are three Webpack plugins as development dependencies: css-loader, source-map-loader, and style-loader. They are all @jupyterlab/builder dependencies, so they are installed together. Therefore, to simplify the package.json file a bit (and consequently the template), especially for new extension developers, I think it would be good to remove them.

Proposed Solution

Delete the css-loader, source-map-loader, and style-loader development dependencies from the following file:

extension-template/template/package.json.jinja

Line 67 in eda2e0d

"devDependencies": {

Please let me know your opinion and if I can help/open a PR.

Thanks!