feat: supported scoped package and replace class

[SethFalco]

Since the original maintainer of jsonresume-theme-class no longer wishes to maintain the project, I've forked it so the jsonresume namespace on GitHub so we can continue maintaining it.

I've already pushed all my updates, got it working with JSON Resume Schema 1.0.0, and even published it to NPM.

• https://github.com/jsonresume/jsonresume-theme-class
• https://www.npmjs.com/package/@jsonresume/jsonresume-theme-class

Now I'd like it to be listed on the website, but one annoyance is that how we've done this, we can't import scoped packages.

I think we should change the behavior here so that we check the package name in full, i.e. @jsonresume/jsonresume-theme-class instead of just class.

My proposed implementation will fall back to the original slug/append approach you had before where elegant will just have jsonresume-theme- prepended to it if no elegant theme exists.

This still requires themes to have the term theme in the name, which I don't think is ideal, but we can review that separately.

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I have not tested this yet.