♻️ 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

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

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

@@ -1 +0,0 @@
-Prism.languages.rip={comment:{pattern:/#.*/,greedy:!0},char:{pattern:/\B`[^\s`'",.:;#\/\\()<>\[\]{}]\b/,greedy:!0},string:{pattern:/("|')(?:\\.|(?!\1)[^\\\r\n])*\1/,greedy:!0},regex:{pattern:/(^|[^/])\/(?!\/)(?:\[[^\n\r\]]*\]|\\.|[^/\\\r\n\[])+\/(?=\s*(?:$|[\r\n,.;})]))/,lookbehind:!0,greedy:!0},keyword:/(?:=>|->)|\b(?:case|catch|class|else|exit|finally|if|raise|return|switch|try)\b/,builtin:/@|\bSystem\b/,boolean:/\b(?:false|true)\b/,date:/\b\d{4}-\d{2}-\d{2}\b/,time:/\b\d{2}:\d{2}:\d{2}\b/,datetime:/\b\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\b/,symbol:/:[^\d\s`'",.:;#\/\\()<>\[\]{}][^\s`'",.:;#\/\\()<>\[\]{}]*/,number:/[+-]?\b(?:\d+\.\d+|\d+)\b/,punctuation:/(?:\.{2,3})|[`,.:;=\/\\()<>\[\]{}]/,reference:/[^\d\s`'",.:;#\/\\()<>\[\]{}][^\s`'",.:;#\/\\()<>\[\]{}]*/};