♻️ 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-wolfram.min.js

@@ -1 +0,0 @@
-Prism.languages.wolfram={comment:/\(\*(?:\(\*(?:[^*]|\*(?!\)))*\*\)|(?!\(\*)[\s\S])*?\*\)/,string:{pattern:/"(?:\\.|[^"\\\r\n])*"/,greedy:!0},keyword:/\b(?:Abs|AbsArg|Accuracy|Block|Do|For|Function|If|Manipulate|Module|Nest|NestList|None|Return|Switch|Table|Which|While)\b/,context:{pattern:/\b\w+`+\w*/,alias:"class-name"},blank:{pattern:/\b\w+_\b/,alias:"regex"},"global-variable":{pattern:/\$\w+/,alias:"variable"},boolean:/\b(?:False|True)\b/,number:/(?:\b(?=\d)|\B(?=\.))(?:0[bo])?(?:(?:\d|0x[\da-f])[\da-f]*(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?j?\b/i,operator:/\/\.|;|=\.|\^=|\^:=|:=|<<|>>|<\||\|>|:>|\|->|->|<-|@@@|@@|@|\/@|=!=|===|==|=|\+|-|\[\/-+%=\]=?|!=|\*\*?=?|\/\/?=?|<[<=>]?|>[=>]?|[&|^~]/,punctuation:/[{}[\];(),.:]/},Prism.languages.mathematica=Prism.languages.wolfram,Prism.languages.wl=Prism.languages.wolfram,Prism.languages.nb=Prism.languages.wolfram;