feat: Update images with Unsplash (hero + illustrations), fix UX/UI, add animations

- Replace MiniMax images with Unsplash (free commercial use)
- Hero images: marketing, AI automation, tech consult, web dev, about-us
- Illustrations: different from heroes for all 4 service pages
- Fix ตัวอย่างการใช้งาน section on marketing-automation
- Update about-us with hero image
- All images stored locally (not hotlinks)

astro.config.mjs

@@ -2,13 +2,15 @@
 import { defineConfig } from 'astro/config';
 import node from '@astrojs/node';
 import db from '@astrojs/db';
+import sitemap from '@astrojs/sitemap';
 import tailwindcss from '@tailwindcss/vite';
 
 export default defineConfig({
+  site: 'https://www.moreminimore.com',
   adapter: node({
     mode: 'standalone'
   }),
-  integrations: [db()],
+  integrations: [db(), sitemap()],
   vite: {
     plugins: [tailwindcss()]
   }