♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
✅ Cookie consent banner included
✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-erb.min.js

@@ -1 +0,0 @@
-!function(e){e.languages.erb={delimiter:{pattern:/^(\s*)<%=?|%>(?=\s*$)/,lookbehind:!0,alias:"punctuation"},ruby:{pattern:/\s*\S[\s\S]*/,alias:"language-ruby",inside:e.languages.ruby}},e.hooks.add("before-tokenize",(function(n){e.languages["markup-templating"].buildPlaceholders(n,"erb",/<%=?(?:[^\r\n]|[\r\n](?!=begin)|[\r\n]=begin\s(?:[^\r\n]|[\r\n](?!=end))*[\r\n]=end)+?%>/g)})),e.hooks.add("after-tokenize",(function(n){e.languages["markup-templating"].tokenizePlaceholders(n,"erb")}))}(Prism);