move ES6 feature detection from home1.css to home1.js

Combine the two inline script blocks into a single try/catch
using new Function() so old browsers fail gracefully.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

groups/home/bootstrap5/home1.js

@@ -1,3 +1,38 @@
+// ES6 feature detection
+(function () {
+  window.isES6 = false;
+  try {
+    new Function([
+      "// Arrow functions",
+      "() => {};",
+      "",
+      "// Class support",
+      "class __ES6FeatureDetectionTest {}",
+      "",
+      "// Object initializer property and method shorthands",
+      "let es6a = true;",
+      "let es6b = {",
+      "  es6a,",
+      "  es6c() { return true; },",
+      "  es6d: [1, 2, 3],",
+      "};",
+      "",
+      "// Object destructuring",
+      "let { es6c, es6d } = es6b;",
+      "",
+      "// Spread operator",
+      "let es6e = [...es6d, 4];",
+      "",
+      "// Ternary operator",
+      "let es6f = es6a ? 'ternary' : 'no ternary';",
+      "",
+      "// Nullish coalescing",
+      "es6a ??= 10;",
+    ].join("\n"))();
+    window.isES6 = true;
+  } catch (e) {}
+})();
+
 const hamburgerComponent = {
   template: `<div class="bigger-fancy-text">
     <i v-bind:class="item.icon" aria-hidden="true"></i>