docs: how to use player without access to CDN?

[stepin]

There are some cases (like html5 ads or intranet apps) when access to internet is restricted. It's unclear how to use the library in this case. It will be good if it will be documented.

Related docs page: https://developers.lottiefiles.com/docs/dotlottie-player/dotlottie-web/

It has sections via npm and via CDN but most js libraries also has artefacts what can be downloaded and added to static files. Instruction how to produce such artefacts are also ok as for me.