add 'biergarten-cassis' and 'biergarten-weizen' themes update CSS variables, and refine .gitignore

src/Website/vite.config.ts

@@ -3,4 +3,7 @@ import { defineConfig } from "vite";
 
 export default defineConfig({
   plugins: [reactRouter()],
+  resolve: {
+    dedupe: ["react", "react-dom"],
+  },
 });