Add Webpack instructions for developping locally with HTTPS

[hleroy]

Description

When following the instructions Developing locally with HTTPS, it will not work if the project is setup with Webpack.

This pull request add the necessary instructions to make it work, including Live Reload.

Checklist:

• I've made sure that tests are updated accordingly (especially if adding or updating a template option)
• I've updated the documentation or confirm that my change doesn't require any updates

Rationale

Webpack is available as a Project Generation Options. Therefore the doc should explain how to develop locally with HTTPS and Webpack.