Tauri license compliance reports

[Laegel]

Add a section dedicated to license compliance reports, for both Rust & JS dependencies.

• need to determine whether it should be in "About", "Docs" or "API";
• generate Rust report with cargo about;
• generate JS report (https://www.npmjs.com/package/nlf, https://fossa.com/).

[simonhyll]

We definitely need a section on this. Should probably go into the section about distributing. Tracking it for the 2.0 docs.