♻️ 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-julia.min.js

@@ -1 +0,0 @@
-Prism.languages.julia={comment:{pattern:/(^|[^\\])(?:#=(?:[^#=]|=(?!#)|#(?!=)|#=(?:[^#=]|=(?!#)|#(?!=))*=#)*=#|#.*)/,lookbehind:!0},regex:{pattern:/r"(?:\\.|[^"\\\r\n])*"[imsx]{0,4}/,greedy:!0},string:{pattern:/"""[\s\S]+?"""|(?:\b\w+)?"(?:\\.|[^"\\\r\n])*"|`(?:[^\\`\r\n]|\\.)*`/,greedy:!0},char:{pattern:/(^|[^\w'])'(?:\\[^\r\n][^'\r\n]*|[^\\\r\n])'/,lookbehind:!0,greedy:!0},keyword:/\b(?:abstract|baremodule|begin|bitstype|break|catch|ccall|const|continue|do|else|elseif|end|export|finally|for|function|global|if|immutable|import|importall|in|let|local|macro|module|print|println|quote|return|struct|try|type|typealias|using|while)\b/,boolean:/\b(?:false|true)\b/,number:/(?:\b(?=\d)|\B(?=\.))(?:0[box])?(?:[\da-f]+(?:_[\da-f]+)*(?:\.(?:\d+(?:_\d+)*)?)?|\.\d+(?:_\d+)*)(?:[efp][+-]?\d+(?:_\d+)*)?j?/i,operator:/&&|\|\||[-+*^%÷⊻&$\\]=?|\/[\/=]?|!=?=?|\|[=>]?|<(?:<=?|[=:|])?|>(?:=|>>?=?)?|==?=?|[~≠≤≥'√∛]/,punctuation:/::?|[{}[\]();,.?]/,constant:/\b(?:(?:Inf|NaN)(?:16|32|64)?|im|pi)\b|[πℯ]/};