use absolute urls for assets so common head can be used on other domains

templates/_common-head.html.twig

@@ -5,7 +5,7 @@
 <link rel="icon" type="image/png" href="https://www.w3.org/assets/logos/w3c/favicon-32.png"/>
 <link rel="apple-touch-icon" type="image/png" href="https://www.w3.org/assets/logos/w3c/favicon-180.png"/>
 
-<link rel="stylesheet" href="{{ asset('styles/core.css?ver=1.4', 'website-2021') }}" media="screen"/>
+<link rel="stylesheet" href="{{ absolute_url(asset('styles/core.css?ver=1.4', 'website-2021')) }}" media="screen"/>
 
 <!--
 CSS Mustard Cut
@@ -14,14 +14,14 @@ Edge, Chrome 39+, Opera 26+, Safari 9+, iOS 9+, Android ~5+, Android UCBrowser ~
 FF 47+
 -->
 <link rel="stylesheet" id="advanced-stylesheet"
-      href="{{ asset('styles/advanced.css?ver=1.4', 'website-2021') }}" media="
+      href="{{ absolute_url(asset('styles/advanced.css?ver=1.4', 'website-2021')) }}" media="
             only print,
             only all and (pointer: fine), only all and (pointer: coarse), only all and (pointer: none),
             only all and (min--moz-device-pixel-ratio:0) and (display-mode:browser), (min--moz-device-pixel-ratio:0) and (display-mode:fullscreen)
         ">
-<link rel="stylesheet" href="{{ asset('styles/print.css', 'website-2021') }}" media="print"/>
+<link rel="stylesheet" href="{{ absolute_url(asset('styles/print.css', 'website-2021')) }}" media="print"/>
 
-<script src="{{ asset('js/libraries/fontfaceobserver.js', 'website-2021') }}"></script>
+<script src="{{ absolute_url(asset('js/libraries/fontfaceobserver.js', 'website-2021')) }}"></script>
 
 <script>
     var myFont = new FontFaceObserver('Noto Sans');
@@ -34,7 +34,7 @@ FF 47+
         var linkEl = document.getElementById('advanced-stylesheet');
         if (window.matchMedia && window.matchMedia(linkEl.media).matches) {
             var script = document.createElement('script');
-            script.src = '{{ asset('js/main.js?ver=1.4', 'website-2021') }}';
+            script.src = '{{ absolute_url(asset('js/main.js?ver=1.4', 'website-2021')) }}';
             script.defer = true;
             document.querySelector('head').appendChild(script);
             (function (H) {