Drop favicon.ico generation (#30375)

app/models/site_upload.rb

@@ -31,17 +31,10 @@ class SiteUpload < ApplicationRecord
         [:"#{size}", { format: 'png', geometry: "#{size}x#{size}#", file_geometry_parser: FastGeometryParser }]
       end.freeze,
 
-    favicon: {
-      ico: {
-        format: 'ico',
-        geometry: '48x48#',
-        file_geometry_parser: FastGeometryParser,
-      }.freeze,
-    }.merge(
+    favicon:
       FAVICON_SIZES.to_h do |size|
         [:"#{size}", { format: 'png', geometry: "#{size}x#{size}#", file_geometry_parser: FastGeometryParser }]
-      end
-    ).freeze,
+      end.freeze,
 
     thumbnail: {
       '@1x': {

app/views/layouts/application.html.haml

@@ -11,8 +11,6 @@
     - if storage_host?
       %link{ rel: 'dns-prefetch', href: storage_host }/
 
-    %link{ rel: 'icon', href: favicon_path('ico') || '/favicon.ico', type: 'image/x-icon' }/
-
     - SiteUpload::FAVICON_SIZES.each do |size|
       %link{ rel: 'icon', sizes: "#{size}x#{size}", href: favicon_path(size.to_i) || frontend_asset_path("icons/favicon-#{size}x#{size}.png"), type: 'image/png' }/