Based on the newest API, `public func createWebFeed(url: String, name: String?, container: Container, validateFeed: Bool, completion: @escaping (Result<WebFeed, Error>) -> Void)`, there should be a `validateFeed:` argument.
Fixes#2193:
• Containers with indentation are supported
• Small icon provider is used
• AssetCatalog updated with SF Symbol images for desktop, iPad, iPhone.
• Title page doesn’t work at the current time.
