Extract favicon_url to CoreComponents

lib/music_library_web/components/core_components.ex

@@ -136,6 +136,11 @@ defmodule MusicLibraryWeb.CoreComponents do
     """
   end
 
+  def favicon_url(url) do
+    uri = URI.parse(url)
+    "https://www.google.com/s2/favicons?domain=#{uri.host}&sz=16"
+  end
+
   ## JS Commands
 
   def show(js \\ %JS{}, selector) do