♻️ 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

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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-less.js

@@ -1,54 +0,0 @@
-/* FIXME :
- :extend() is not handled specifically : its highlighting is buggy.
- Mixin usage must be inside a ruleset to be highlighted.
- At-rules (e.g. import) containing interpolations are buggy.
- Detached rulesets are highlighted as at-rules.
- A comment before a mixin usage prevents the latter to be properly highlighted.
- */
-
-Prism.languages.less = Prism.languages.extend('css', {
-	'comment': [
-		/\/\*[\s\S]*?\*\//,
-		{
-			pattern: /(^|[^\\])\/\/.*/,
-			lookbehind: true
-		}
-	],
-	'atrule': {
-		pattern: /@[\w-](?:\((?:[^(){}]|\([^(){}]*\))*\)|[^(){};\s]|\s+(?!\s))*?(?=\s*\{)/,
-		inside: {
-			'punctuation': /[:()]/
-		}
-	},
-	// selectors and mixins are considered the same
-	'selector': {
-		pattern: /(?:@\{[\w-]+\}|[^{};\s@])(?:@\{[\w-]+\}|\((?:[^(){}]|\([^(){}]*\))*\)|[^(){};@\s]|\s+(?!\s))*?(?=\s*\{)/,
-		inside: {
-			// mixin parameters
-			'variable': /@+[\w-]+/
-		}
-	},
-
-	'property': /(?:@\{[\w-]+\}|[\w-])+(?:\+_?)?(?=\s*:)/,
-	'operator': /[+\-*\/]/
-});
-
-Prism.languages.insertBefore('less', 'property', {
-	'variable': [
-		// Variable declaration (the colon must be consumed!)
-		{
-			pattern: /@[\w-]+\s*:/,
-			inside: {
-				'punctuation': /:/
-			}
-		},
-
-		// Variable usage
-		/@@?[\w-]+/
-	],
-	'mixin-usage': {
-		pattern: /([{;]\s*)[.#](?!\d)[\w-].*?(?=[(;])/,
-		lookbehind: true,
-		alias: 'function'
-	}
-});