v0.3.1 - Add 11 new style variations (4 light, 4 dark + 3 earlier dark)

Add Rose, Sand, Lavender, Mint (light) and Ember, Arctic, Amethyst,
Slate, Mocha, Nebula, Obsidian (dark) color palettes for the Design
Editor. Total of 15 style variations available (7 light, 7 dark).

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

package.json

@@ -1,6 +1,6 @@
 {
     "name": "wp-bootstrap",
-    "version": "0.3.0",
+    "version": "0.3.1",
     "description": "WordPress Theme built with Bootstrap 5",
     "author": "Marco Graetsch <magdev3.0@gmail.com>",
     "license": "GPL-2.0-or-later",