We have integration tests for at least webview_flutter and video_player that are currently hitting external URLs, which is random test failure waiting to happen (this has already been a problem at least once). In the long term we probably need to have the tests run their own local server for some use cases, but for most of them just having a static site We should use local web servers so that:

• we can change in-repo,
• we know won't suddenly change out from under us (e.g., removal of a video we are pointing at), and
• won't have unexpected behaviors (like when a Google page we were pointing to started redirecting our tests to a "suspicious activity" page when run from CI)

would solve a lot of potential problems. We should be able to do that via GitHub pages running on flutter/plugins.