Update favicons, app icons and OpenGraph image

Author: querkmachine

packages/govuk-frontend/src/govuk/assets/images/favicon.ico

@@ -8,12 +8,12 @@
     <meta charset="utf-8">
     <title {%- if pageTitleLang %} lang="{{ pageTitleLang }}"{% endif %}>{% block pageTitle %}GOV.UK - The best place to find government services and information{% endblock %}</title>
     <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
-    <meta name="theme-color" content="{{ themeColor | default("#0b0c0c", true) }}"> {#- Hardcoded value of $govuk-black #}
+    <meta name="theme-color" content="{{ themeColor | default("#1d70b8", true) }}"> {#- Hardcoded value of $govuk-brand-blue #}
 
     {% block headIcons %}
       <link rel="icon" sizes="48x48" href="{{ assetPath | default("/assets", true) }}/images/favicon.ico">
       <link rel="icon" sizes="any" href="{{ assetPath | default("/assets", true) }}/images/favicon.svg" type="image/svg+xml">
-      <link rel="mask-icon" href="{{ assetPath | default("/assets", true) }}/images/govuk-icon-mask.svg" color="{{ themeColor | default("#0b0c0c") }}"> {#- Hardcoded value of $govuk-black #}
+      <link rel="mask-icon" href="{{ assetPath | default("/assets", true) }}/images/govuk-icon-mask.svg" color="{{ themeColor | default("#1d70b8") }}"> {#- Hardcoded value of $govuk-brand-blue #}
       <link rel="apple-touch-icon" href="{{ assetPath | default("/assets", true) }}/images/govuk-icon-180.png">
       <link rel="manifest" href="{{ assetPath | default("/assets", true) }}/manifest.json">
     {% endblock %}