assets: preserve supplied Felis icon kit

panel/index.html

@@ -3,6 +3,14 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#65a26c" />
+    <link rel="icon" href="/favicon.ico" sizes="any" />
+    <link rel="icon" href="/favicon.svg" type="image/svg+xml" />
+    <link rel="icon" href="/favicon-32x32.png" type="image/png" sizes="32x32" />
+    <link rel="icon" href="/favicon-16x16.png" type="image/png" sizes="16x16" />
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" sizes="180x180" />
+    <link rel="mask-icon" href="/safari-pinned-tab.svg" color="#65a26c" />
+    <link rel="manifest" href="/site.webmanifest" />
     <title>Felis · Console</title>
     <script>
       try {