Bundle select2 as npm dependency instead of local files

- Added select2 as npm dependency
- Removed local select2 library files to eliminate duplication
- Updated webpack config to copy select2.css to dist folder
- Added global jQuery attachment fix for select2
- Updated README to reflect bundled dependency approach
- Enabled select2 demo functionality

dist/bootstrap5-editable/js/bootstrap-editable.js.LICENSE.txt

@@ -10,6 +10,14 @@
  * Licensed under the Apache License v2.0 (https://www.apache.org/licenses/LICENSE-2.0)
  */
 
+/*!
+ * Select2 4.1.0-rc.0
+ * https://select2.github.io
+ *
+ * Released under the MIT license
+ * https://github.com/select2/select2/blob/master/LICENSE.md
+ */
+
 /*!
  * jQuery JavaScript Library v3.7.1
  * https://jquery.com/
@@ -20,3 +28,8 @@
  *
  * Date: 2023-08-28T13:37Z
  */
+
+/**
+ * @license almond 0.3.3 Copyright jQuery Foundation and other contributors.
+ * Released under MIT license, http://github.com/requirejs/almond/LICENSE
+ */