Update astro config and remove unused assets

Configure the website to use the `../public` directory for static assets
and remove several unused image files from the public directory.

Author: thedavidweng

website/astro.config.mjs

@@ -5,6 +5,7 @@ import { defineConfig } from 'astro/config';
 export default defineConfig({
   site: 'https://thedavidweng.github.io',
   base: '/money/',
+  publicDir: '../public',
   output: 'static',
   devToolbar: {
     enabled: false,

website/package.json

@@ -8,10 +8,11 @@
   "scripts": {
     "dev": "astro dev",
     "build": "astro build",
+    "test": "npm run build && node --test",
     "preview": "astro preview",
     "astro": "astro"
   },
   "dependencies": {
     "astro": "^6.3.1"
   }
-}
+}