♻️ 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-mel.min.js

@@ -1 +0,0 @@
-Prism.languages.mel={comment:{pattern:/\/\/.*|\/\*[\s\S]*?\*\//,greedy:!0},code:{pattern:/`(?:\\.|[^\\`])*`/,greedy:!0,alias:"italic",inside:{delimiter:{pattern:/^`|`$/,alias:"punctuation"},statement:{pattern:/[\s\S]+/,inside:null}}},string:{pattern:/"(?:\\.|[^\\"\r\n])*"/,greedy:!0},variable:/\$\w+/,number:/\b0x[\da-fA-F]+\b|\b\d+(?:\.\d*)?|\B\.\d+/,flag:{pattern:/-[^\d\W]\w*/,alias:"operator"},keyword:/\b(?:break|case|continue|default|do|else|float|for|global|if|in|int|matrix|proc|return|string|switch|vector|while)\b/,function:{pattern:/((?:^|[{;])[ \t]*)[a-z_]\w*\b(?!\s*(?:\.(?!\.)|[[{=]))|\b[a-z_]\w*(?=[ \t]*\()/im,lookbehind:!0,greedy:!0},"tensor-punctuation":{pattern:/<<|>>/,alias:"punctuation"},operator:/\+[+=]?|-[-=]?|&&|\|\||[<>]=?|[*\/!=]=?|[%^]/,punctuation:/[.,:;?\[\](){}]/},Prism.languages.mel.code.inside.statement.inside=Prism.languages.mel;