does iWeb still exist?

Yes — it can be purchased HERE. And you can read more about iWeb HERE.

You're welcome. If you're creating a new site, you may want to consider using an app that, unlike iWeb, is supported and continually improved — such as the free Weebly. ...Since it's browser-based, you'll be able to update your site from any modern Mac or PC. And...

"Weebly's net promoter score — an industry calculation of how likely users are to recommend a service to others — is an unusually high 80%." (Source)

You can get an idea of Weebly's capabilities by looking at their featured sites.