The current RxJS documentation site is https://rxjs.dev/. It is very similar to Angular documentation site (https://angular.io/) so I reused most code. Images on the documentation site seem to be broken and so the scrapper cannot download them. You can see an example of a broken image at https://rxjs.dev/api/operators/buffer. Related to https://github.com/freeCodeCamp/devdocs/issues/939
Filipe Silva