[web-client] simple theme: build & development env based on vite.

Vite is a build tool, it consists of two major parts [1]:

- A dev server that provides rich feature enhancements over native ES modules,
  for example extremely fast Hot Module Replacement (HMR).

- A build command that bundles your code with Rollup, pre-configured to output
  highly optimized static assets for production.

[1] https://vite.dev/guide/

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

client/simple/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "simple",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "build": "vite build",
+  },
+  "devDependencies": {
+    "copy-webpack-plugin": "^12.0.2",
+    "css-loader": "^7.1.2",
+    "filemanager-webpack-plugin": "^8.0.0",
+    "leaflet": "^1.9.4",
+    "less": "^4.2.2",
+    "less-loader": "^12.2.0",
+    "normalize.css": "^8.0.1",
+    "style-loader": "^4.0.0",
+    "vite": "^6.0.7",
+    "vite-plugin-static-copy": "^2.2.0",
+    "webpack": "^5.97.1",
+    "webpack-cli": "^6.0.1"
+  },
+  "dependencies": {
+    "autocomplete-js": "^2.7.1"
+  }
+}