♻️ 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-dhall.min.js

@@ -1 +0,0 @@
-Prism.languages.dhall={comment:/--.*|\{-(?:[^-{]|-(?!\})|\{(?!-)|\{-(?:[^-{]|-(?!\})|\{(?!-))*-\})*-\}/,string:{pattern:/"(?:[^"\\]|\\.)*"|''(?:[^']|'(?!')|'''|''\$\{)*''(?!'|\$)/,greedy:!0,inside:{interpolation:{pattern:/\$\{[^{}]*\}/,inside:{expression:{pattern:/(^\$\{)[\s\S]+(?=\}$)/,lookbehind:!0,alias:"language-dhall",inside:null},punctuation:/\$\{|\}/}}}},label:{pattern:/`[^`]*`/,greedy:!0},url:{pattern:/\bhttps?:\/\/[\w.:%!$&'*+;=@~-]+(?:\/[\w.:%!$&'*+;=@~-]*)*(?:\?[/?\w.:%!$&'*+;=@~-]*)?/,greedy:!0},env:{pattern:/\benv:(?:(?!\d)\w+|"(?:[^"\\=]|\\.)*")/,greedy:!0,inside:{function:/^env/,operator:/^:/,variable:/[\s\S]+/}},hash:{pattern:/\bsha256:[\da-fA-F]{64}\b/,inside:{function:/sha256/,operator:/:/,number:/[\da-fA-F]{64}/}},keyword:/\b(?:as|assert|else|forall|if|in|let|merge|missing|then|toMap|using|with)\b|\u2200/,builtin:/\b(?:None|Some)\b/,boolean:/\b(?:False|True)\b/,number:/\bNaN\b|-?\bInfinity\b|[+-]?\b(?:0x[\da-fA-F]+|\d+(?:\.\d+)?(?:e[+-]?\d+)?)\b/,operator:/\/\\|\/\/\\\\|&&|\|\||===|[!=]=|\/\/|->|\+\+|::|[+*#@=:?<>|\\\u2227\u2a53\u2261\u2afd\u03bb\u2192]/,punctuation:/\.\.|[{}\[\](),./]/,"class-name":/\b[A-Z]\w*\b/},Prism.languages.dhall.string.inside.interpolation.inside.expression.inside=Prism.languages.dhall;