Reorganize project structure and finalize Bootstrap 5 cleanup

- Create demo folder and move test files with proper naming
- Rename test.html/js/php to demo/index.html/demo.js/demo.php
- Update Gruntfile.js to Bootstrap 5 only configuration
- Clean up package.json dependencies (remove unused webpack/popper.js)
- Remove non-Bootstrap 5 dist directories
- Update webpack config to use demo files
- Fix demo paths and ensure fully functional demo

demo/demo.php

@@ -0,0 +1,30 @@
+<?php
+header("Content-Type: application/json");
+
+if ($_SERVER['REQUEST_METHOD'] === 'GET') {
+    // Sample data for select dropdown
+    echo json_encode([
+        ["value" => 1, "text" => "Yes"],
+        ["value" => 0, "text" => "No"]
+    ]);
+} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    // Simulate saving the data and returning success response
+    $input = json_decode(file_get_contents("php://input"), true);
+
+    // If JSON is empty, try to read form-encoded data
+    if (!$input) {
+        $input = $_POST;
+    }
+
+    if (!isset($input['name']) || !isset($input['value'])) {
+        http_response_code(400);
+        echo json_encode(["error" => "Invalid request"]);
+        exit;
+    }
+
+    // Normally, you would store this in a database, but for testing, just return success
+    echo json_encode(["success" => true, "newValue" => $input['value']]);
+} else {
+    http_response_code(405); // Method Not Allowed
+    echo json_encode(["error" => "Method Not Allowed"]);
+}