Improve the licensing filter

[vuillaut]

At the moment the filter just shows the list of licenses from the content.

We could have something more useful to users, for example, grouping licenses into:

• permissive
• copy-left
• proprietary
• others

[vuillaut]

For the classification, we can rely on external DB or tools:

• https://scancode-licensedb.aboutcode.org/
• https://github.com/github/choosealicense.com/tree/gh-pages/_licenses
• https://deps.dev/
• https://www.npmjs.com/package/spdx-license-ids