Does Apple have a distribution platform for web apps?
Apple does not have a dedicated web app store or platform. Apple's iOS App Store and the Mac App Store both require an app bundle be submitted.

It is possible to wrap up a locally hosted web site as an application. A minimal amount of code is required for this approach. This can then be submitted to Apple for review and possible inclusion.

See results for the search wrap web site in ios app webview for possible implementation approaches.