Update navigation fallback and add custom MIME types

Expanded navigation fallback exclusions to include framework, JS, and content paths; removed image exclusions. Added custom MIME types for .js and .wasm files.

Author: gvreddy04

BlazorExpress.ChartJS.Demo.WebAssembly/wwwroot/staticwebapp.config.json

@@ -1,6 +1,10 @@
 {
   "navigationFallback": {
     "rewrite": "/index.html",
-    "exclude": [ "/images/*.{png,jpg,gif}", "/css/*" ]
+    "exclude": [ "/_framework/*", "/css/*", "/js/*", "/_content/*" ]
+  },
+  "mimeTypes": {
+    ".js": "application/javascript",
+    ".wasm": "application/wasm"
   }
-}
+}