♻️ 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

✅ 11 pages built successfully
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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-matlab.js

@@ -1,16 +0,0 @@
-Prism.languages.matlab = {
-	'comment': [
-		/%\{[\s\S]*?\}%/,
-		/%.+/
-	],
-	'string': {
-		pattern: /\B'(?:''|[^'\r\n])*'/,
-		greedy: true
-	},
-	// FIXME We could handle imaginary numbers as a whole
-	'number': /(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:[eE][+-]?\d+)?(?:[ij])?|\b[ij]\b/,
-	'keyword': /\b(?:NaN|break|case|catch|continue|else|elseif|end|for|function|if|inf|otherwise|parfor|pause|pi|return|switch|try|while)\b/,
-	'function': /\b(?!\d)\w+(?=\s*\()/,
-	'operator': /\.?[*^\/\\']|[+\-:@]|[<>=~]=?|&&?|\|\|?/,
-	'punctuation': /\.{3}|[.,;\[\](){}!]/
-};