♻️ 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-r.js

@@ -1,22 +0,0 @@
-Prism.languages.r = {
-	'comment': /#.*/,
-	'string': {
-		pattern: /(['"])(?:\\.|(?!\1)[^\\\r\n])*\1/,
-		greedy: true
-	},
-	'percent-operator': {
-		// Includes user-defined operators
-		// and %%, %*%, %/%, %in%, %o%, %x%
-		pattern: /%[^%\s]*%/,
-		alias: 'operator'
-	},
-	'boolean': /\b(?:FALSE|TRUE)\b/,
-	'ellipsis': /\.\.(?:\.|\d+)/,
-	'number': [
-		/\b(?:Inf|NaN)\b/,
-		/(?:\b0x[\dA-Fa-f]+(?:\.\d*)?|\b\d+(?:\.\d*)?|\B\.\d+)(?:[EePp][+-]?\d+)?[iL]?/
-	],
-	'keyword': /\b(?:NA|NA_character_|NA_complex_|NA_integer_|NA_real_|NULL|break|else|for|function|if|in|next|repeat|while)\b/,
-	'operator': /->?>?|<(?:=|<?-)?|[>=!]=?|::?|&&?|\|\|?|[+*\/^$@~]/,
-	'punctuation': /[(){}\[\],;]/
-};