♻️ 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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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/prismjs/components/prism-supercollider.js

@@ -1,36 +0,0 @@
-Prism.languages.supercollider = {
-	'comment': {
-		pattern: /\/\/.*|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\//,
-		greedy: true
-	},
-	'string': {
-		pattern: /(^|[^\\])"(?:[^"\\]|\\[\s\S])*"/,
-		lookbehind: true,
-		greedy: true
-	},
-	'char': {
-		pattern: /\$(?:[^\\\r\n]|\\.)/,
-		greedy: true
-	},
-	'symbol': {
-		pattern: /(^|[^\\])'(?:[^'\\]|\\[\s\S])*'|\\\w+/,
-		lookbehind: true,
-		greedy: true
-	},
-
-	'keyword': /\b(?:_|arg|classvar|const|nil|var|while)\b/,
-	'boolean': /\b(?:false|true)\b/,
-
-	'label': {
-		pattern: /\b[a-z_]\w*(?=\s*:)/,
-		alias: 'property'
-	},
-
-	'number': /\b(?:inf|pi|0x[0-9a-fA-F]+|\d+(?:\.\d+)?(?:[eE][+-]?\d+)?(?:pi)?|\d+r[0-9a-zA-Z]+(?:\.[0-9a-zA-Z]+)?|\d+[sb]{1,4}\d*)\b/,
-	'class-name': /\b[A-Z]\w*\b/,
-
-	'operator': /\.{2,3}|#(?![[{])|&&|[!=]==?|\+>>|\+{1,3}|-[->]|=>|>>|\?\?|@\|?@|\|(?:@|[!=]=)?\||!\?|<[!=>]|\*{1,2}|<{2,3}\*?|[-!%&/<>?@|=`]/,
-	'punctuation': /[{}()[\].:,;]|#[[{]/
-};
-
-Prism.languages.sclang = Prism.languages.supercollider;