♻️ 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-j.js

@@ -1,28 +0,0 @@
-Prism.languages.j = {
-	'comment': {
-		pattern: /\bNB\..*/,
-		greedy: true
-	},
-	'string': {
-		pattern: /'(?:''|[^'\r\n])*'/,
-		greedy: true
-	},
-	'keyword': /\b(?:(?:CR|LF|adverb|conjunction|def|define|dyad|monad|noun|verb)\b|(?:assert|break|case|catch[dt]?|continue|do|else|elseif|end|fcase|for|for_\w+|goto_\w+|if|label_\w+|return|select|throw|try|while|whilst)\.)/,
-	'verb': {
-		// Negative look-ahead prevents bad highlighting
-		// of ^: ;. =. =: !. !:
-		pattern: /(?!\^:|;\.|[=!][.:])(?:\{(?:\.|::?)?|p(?:\.\.?|:)|[=!\]]|[<>+*\-%$|,#][.:]?|[?^]\.?|[;\[]:?|[~}"i][.:]|[ACeEIjLor]\.|(?:[_\/\\qsux]|_?\d):)/,
-		alias: 'keyword'
-	},
-	'number': /\b_?(?:(?!\d:)\d+(?:\.\d+)?(?:(?:ad|ar|[ejpx])_?\d+(?:\.\d+)?)*(?:b_?[\da-z]+(?:\.[\da-z]+)?)?|_\b(?!\.))/,
-	'adverb': {
-		pattern: /[~}]|[\/\\]\.?|[bfM]\.|t[.:]/,
-		alias: 'builtin'
-	},
-	'operator': /[=a][.:]|_\./,
-	'conjunction': {
-		pattern: /&(?:\.:?|:)?|[.:@][.:]?|[!D][.:]|[;dHT]\.|`:?|[\^LS]:|"/,
-		alias: 'variable'
-	},
-	'punctuation': /[()]/
-};