♻️ 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/html-derivative.mjs

@@ -1,8 +0,0 @@
-import html from './html.mjs'
-
-const lang = Object.freeze(JSON.parse("{\"displayName\":\"HTML (Derivative)\",\"injections\":{\"R:text.html - (comment.block, text.html meta.embedded, meta.tag.*.*.html, meta.tag.*.*.*.html, meta.tag.*.*.*.*.html)\":{\"patterns\":[{\"match\":\"<\",\"name\":\"invalid.illegal.bad-angle-bracket.html\"}]}},\"name\":\"html-derivative\",\"patterns\":[{\"include\":\"text.html.basic#core-minus-invalid\"},{\"begin\":\"(</?)(\\\\w[^<>\\\\s]*)(?<!/)\",\"beginCaptures\":{\"1\":{\"name\":\"punctuation.definition.tag.begin.html\"},\"2\":{\"name\":\"entity.name.tag.html\"}},\"end\":\"((?: ?/)?>)\",\"endCaptures\":{\"1\":{\"name\":\"punctuation.definition.tag.end.html\"}},\"name\":\"meta.tag.other.unrecognized.html.derivative\",\"patterns\":[{\"include\":\"text.html.basic#attribute\"}]}],\"scopeName\":\"text.html.derivative\",\"embeddedLangs\":[\"html\"]}"))
-
-export default [
-...html,
-lang
-]