Consider New Strategy for iTunes/Apple icons

iTunes links to a variety of content that is branded individually by Apple.
They have independent apps and logos; at the moment, they might have _similar_ URL standards (such as starting with "itunes") but that's likely changing in the near future.

- iTunes logo: https://www.apple.com/itunes/marketing-on-itunes/identity-guidelines.html#itunes-store-lockups
- Apple Podcasts: https://www.apple.com/itunes/marketing-on-podcasts/identity-guidelines.html#apple-podcasts-icon
- Apple Music: https://www.apple.com/itunes/marketing-on-music/identity-guidelines.html#apple-music-icon
- Apple App Store: https://developer.apple.com/app-store/marketing/guidelines/
* **this is the icon currently implemented on Social Logos**
- Apple Books: https://www.apple.com/itunes/marketing-with-apple-books/identity-guidelines.html#apple-books-icon

Start by reviewing the Apple identity-guideline links in the issue and the current Apple App Store icon in Social Logos. No file, test, or entry point is named, so first locate the existing iTunes/Social Logos icon handling. Done should be a decided strategy for representing the separately branded Apple services, with an agreed implementation scope.

Written by the indexing model from the issue text.