♻️ 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-bnf.js

@@ -1,21 +0,0 @@
-Prism.languages.bnf = {
-	'string': {
-		pattern: /"[^\r\n"]*"|'[^\r\n']*'/
-	},
-	'definition': {
-		pattern: /<[^<>\r\n\t]+>(?=\s*::=)/,
-		alias: ['rule', 'keyword'],
-		inside: {
-			'punctuation': /^<|>$/
-		}
-	},
-	'rule': {
-		pattern: /<[^<>\r\n\t]+>/,
-		inside: {
-			'punctuation': /^<|>$/
-		}
-	},
-	'operator': /::=|[|()[\]{}*+?]|\.{3}/
-};
-
-Prism.languages.rbnf = Prism.languages.bnf;