Update icon references

- Include icons references in the new manifest.json file in the head section instead
- Remove request to the manifest.json and the asset path for this file

app/assets/config/govuk_publishing_components_manifest.js

@@ -2,7 +2,6 @@
 //= link_tree ../images
 //= link_tree ../../../node_modules/govuk-frontend/dist/govuk/assets/images
 //= link_tree ../../../node_modules/govuk-frontend/dist/govuk/assets/fonts
-//= link_tree ../../../node_modules/govuk-frontend/dist/govuk/assets
 
 // Create asset files of each of the files in these directory
 //= link_directory ../javascripts/component_guide

app/views/govuk_publishing_components/components/_layout_for_public.html.erb

@@ -83,8 +83,9 @@
     <link rel="icon" sizes="48x48" href="<%= asset_path 'favicon.ico' %>">
     <link rel="icon" sizes="any" href="<%= asset_path 'favicon.svg' %>" type="image/svg+xml">
     <link rel="mask-icon" href="<%= asset_path 'govuk-icon-mask.svg' %>" color="#0b0c0c">
+    <link rel="icon" href="<%= asset_path 'govuk-icon-512.png' %>">
+    <link rel="icon" href="<%= asset_path 'govuk-icon-192.png' %>">
     <link rel="apple-touch-icon" href="<%= asset_path 'govuk-icon-180.png' %>">
-    <link rel="manifest" href="<%= asset_path "manifest.json" %>">
 
     <meta name="theme-color" content="#0b0c0c" />
     <meta name="viewport" content="width=device-width, initial-scale=1">

config/initializers/assets.rb

@@ -18,7 +18,6 @@
 Rails.application.config.assets.paths += %W[
   #{__dir__}/../../node_modules/govuk-frontend/dist/govuk/assets/images
   #{__dir__}/../../node_modules/govuk-frontend/dist/govuk/assets/fonts
-  #{__dir__}/../../node_modules/govuk-frontend/dist/govuk/assets
   #{__dir__}/../../node_modules/govuk-frontend/dist
   #{__dir__}/../../node_modules/
 ]