Feed favicons

[twm]

Harvest icon(s) for the feed from the linked site URL, or the first article's URL. Potential icon sources:

• /favicon.ico
• <link rel="icon">
• Safari pinned tab icons
• <link rel="apple-touch-icon"> (does anyone actually use this though?)
• <link rel="apple-touch-icon-precomposed">
• Web app manifest icons array

Yarrharr should compile a list of possible icons and allow the user to select one on the edit feed page.

[twm]

Some prior art: https://github.com/mat/besticon/