♻️ 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
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✅ 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-roboconf.min.js

@@ -1 +0,0 @@
-Prism.languages.roboconf={comment:/#.*/,keyword:{pattern:/(^|\s)(?:(?:external|import)\b|(?:facet|instance of)(?=[ \t]+[\w-]+[ \t]*\{))/,lookbehind:!0},component:{pattern:/[\w-]+(?=[ \t]*\{)/,alias:"variable"},property:/[\w.-]+(?=[ \t]*:)/,value:{pattern:/(=[ \t]*(?![ \t]))[^,;]+/,lookbehind:!0,alias:"attr-value"},optional:{pattern:/\(optional\)/,alias:"builtin"},wildcard:{pattern:/(\.)\*/,lookbehind:!0,alias:"operator"},punctuation:/[{},.;:=]/};