feat: Support Smart App Banners
Example
In _config.yml
(site config) or page config (has precedence over site config)
apple-itunes-app:
app-id: 1580245991 # KDE Connect iOS
Motivation
Smart App Banners will direct users to download iOS application from the App Store, which will help KDE Connect users discover that we know have a new KDE Connect iOS client on the App Store.
Once the user dismiss the banner, it never shows up again, so it is helpful to limit the banner to only some specific pages instead of the entire site sometimes.