fix: resolve mixed content and upload payload too large errors

index.html

@@ -3,6 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
     <title>Titan - Product configurator.</title>
   </head>
   <body>