♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

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

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

@@ -1 +0,0 @@
-!function(e){var n=/\$(?:\w[a-z\d]*(?:_[^\x00-\x1F\s"'\\()$]*)?|\{[^}\s"'\\]+\})/i;e.languages.nginx={comment:{pattern:/(^|[\s{};])#.*/,lookbehind:!0,greedy:!0},directive:{pattern:/(^|\s)\w(?:[^;{}"'\\\s]|\\.|"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*'|\s+(?:#.*(?!.)|(?![#\s])))*?(?=\s*[;{])/,lookbehind:!0,greedy:!0,inside:{string:{pattern:/((?:^|[^\\])(?:\\\\)*)(?:"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*')/,lookbehind:!0,greedy:!0,inside:{escape:{pattern:/\\["'\\nrt]/,alias:"entity"},variable:n}},comment:{pattern:/(\s)#.*/,lookbehind:!0,greedy:!0},keyword:{pattern:/^\S+/,greedy:!0},boolean:{pattern:/(\s)(?:off|on)(?!\S)/,lookbehind:!0},number:{pattern:/(\s)\d+[a-z]*(?!\S)/i,lookbehind:!0},variable:n}},punctuation:/[{};]/}}(Prism);