Convert URL encoded images to inline SVGs with fa-icon (#303)

Avoid data: URL loading and just inject SVG inline directly for logo, receipt and loader
Additional favicon path fixes

---------
Co-authored-by: Henry Wilkinson <henry@wilkinson.graphics>

site/embed.html

@@ -6,9 +6,9 @@
         background-color: lightgrey;
       }
     </style>
-    <link rel="icon" href="/favicon.ico" sizes="32x32">
-    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
-    <link rel="apple-touch-icon" href="/apple-touch-icon.png">
+    <link rel="icon" href="/favicons/favicon.ico" sizes="32x32">
+    <link rel="icon" href="/favicons.favicon.svg" type="image/svg+xml">
+    <link rel="apple-touch-icon" href="/favicons/apple-touch-icon.png">
   </head>
   <body>
     <replay-web-page