Use youtube itself for generating video queries

[davidovski]

Currently LibreY gets its video results from a configured invidious instance. However I am concerned that most instance maintainers don't update this to point to a different instance, which may cause unecessary extra load on that instance.

Other than the fact that invidious provides a clean API for video search, I don't see any reason why we shouldn't fetch video results from youtube.com directly, as we are already proxying requests to google.