♻️ 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-racket.js

@@ -1,18 +0,0 @@
-Prism.languages.racket = Prism.languages.extend('scheme', {
-	'lambda-parameter': {
-		// the racket lambda syntax is a lot more complex, so we won't even attempt to capture it.
-		// this will just prevent false positives of the `function` pattern
-		pattern: /([(\[]lambda\s+[(\[])[^()\[\]'\s]+/,
-		lookbehind: true
-	}
-});
-
-Prism.languages.insertBefore('racket', 'string', {
-	'lang': {
-		pattern: /^#lang.+/m,
-		greedy: true,
-		alias: 'keyword'
-	}
-});
-
-Prism.languages.rkt = Prism.languages.racket;