♻️ 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
✅ Cookie consent banner included
✅ 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-gn.js

@@ -1,51 +0,0 @@
-// https://gn.googlesource.com/gn/+/refs/heads/main/docs/reference.md#grammar
-
-Prism.languages.gn = {
-	'comment': {
-		pattern: /#.*/,
-		greedy: true
-	},
-	'string-literal': {
-		pattern: /(^|[^\\"])"(?:[^\r\n"\\]|\\.)*"/,
-		lookbehind: true,
-		greedy: true,
-		inside: {
-			'interpolation': {
-				pattern: /((?:^|[^\\])(?:\\{2})*)\$(?:\{[\s\S]*?\}|[a-zA-Z_]\w*|0x[a-fA-F0-9]{2})/,
-				lookbehind: true,
-				inside: {
-					'number': /^\$0x[\s\S]{2}$/,
-					'variable': /^\$\w+$/,
-					'interpolation-punctuation': {
-						pattern: /^\$\{|\}$/,
-						alias: 'punctuation'
-					},
-					'expression': {
-						pattern: /[\s\S]+/,
-						inside: null // see below
-					}
-				}
-			},
-			'string': /[\s\S]+/
-		}
-	},
-
-	'keyword': /\b(?:else|if)\b/,
-	'boolean': /\b(?:false|true)\b/,
-	'builtin-function': {
-		// a few functions get special highlighting to improve readability
-		pattern: /\b(?:assert|defined|foreach|import|pool|print|template|tool|toolchain)(?=\s*\()/i,
-		alias: 'keyword'
-	},
-	'function': /\b[a-z_]\w*(?=\s*\()/i,
-	'constant': /\b(?:current_cpu|current_os|current_toolchain|default_toolchain|host_cpu|host_os|root_build_dir|root_gen_dir|root_out_dir|target_cpu|target_gen_dir|target_os|target_out_dir)\b/,
-
-	'number': /-?\b\d+\b/,
-
-	'operator': /[-+!=<>]=?|&&|\|\|/,
-	'punctuation': /[(){}[\],.]/
-};
-
-Prism.languages.gn['string-literal'].inside['interpolation'].inside['expression'].inside = Prism.languages.gn;
-
-Prism.languages.gni = Prism.languages.gn;