Don't know what you mean by saying it has no relation; I've been using that site for searching components while developing my PWA based on Polymer. I can install components with yarn or npm just fine, using instructions and examples from there.
Yes, but the website is not only for polymer elements, you can find components written in other libraries too, like lit, svelte or even vue. That's what I meant - it is just a website that serves as information aggregator from bower/npm.
Don't know what you mean by saying it has no relation; I've been using that site for searching components while developing my PWA based on Polymer. I can install components with yarn or npm just fine, using instructions and examples from there.