♻️ 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/@shikijs/langs/dist/codeowners.mjs

@@ -1,5 +0,0 @@
-const lang = Object.freeze(JSON.parse("{\"displayName\":\"CODEOWNERS\",\"name\":\"codeowners\",\"patterns\":[{\"include\":\"#comment\"},{\"include\":\"#pattern\"},{\"include\":\"#owner\"}],\"repository\":{\"comment\":{\"patterns\":[{\"begin\":\"^\\\\s*#\",\"captures\":{\"0\":{\"name\":\"punctuation.definition.comment.codeowners\"}},\"end\":\"$\",\"name\":\"comment.line.codeowners\"}]},\"owner\":{\"match\":\"\\\\S*@\\\\S+\",\"name\":\"storage.type.function.codeowners\"},\"pattern\":{\"match\":\"^\\\\s*(\\\\S+)\",\"name\":\"variable.other.codeowners\"}},\"scopeName\":\"text.codeowners\"}"))
-
-export default [
-lang
-]