♻️ 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.js

@@ -1,29 +0,0 @@
-Prism.languages.wolfram = {
-	'comment': // Allow one level of nesting - note: regex taken from applescipt
-		/\(\*(?:\(\*(?:[^*]|\*(?!\)))*\*\)|(?!\(\*)[\s\S])*?\*\)/,
-	'string': {
-		pattern: /"(?:\\.|[^"\\\r\n])*"/,
-		greedy: true
-	},
-	'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;