♻️ 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/plugins/line-highlight/prism-line-highlight.css

@@ -1,70 +0,0 @@
-pre[data-line] {
-	position: relative;
-	padding: 1em 0 1em 3em;
-}
-
-.line-highlight {
-	position: absolute;
-	left: 0;
-	right: 0;
-	padding: inherit 0;
-	margin-top: 1em; /* Same as .prism’s padding-top */
-
-	background: hsla(24, 20%, 50%,.08);
-	background: linear-gradient(to right, hsla(24, 20%, 50%,.1) 70%, hsla(24, 20%, 50%,0));
-
-	pointer-events: none;
-
-	line-height: inherit;
-	white-space: pre;
-}
-
-@media print {
-	.line-highlight {
-		/*
-		 * This will prevent browsers from replacing the background color with white.
-		 * It's necessary because the element is layered on top of the displayed code.
-		 */
-		-webkit-print-color-adjust: exact;
-		color-adjust: exact;
-	}
-}
-
-	.line-highlight:before,
-	.line-highlight[data-end]:after {
-		content: attr(data-start);
-		position: absolute;
-		top: .4em;
-		left: .6em;
-		min-width: 1em;
-		padding: 0 .5em;
-		background-color: hsla(24, 20%, 50%,.4);
-		color: hsl(24, 20%, 95%);
-		font: bold 65%/1.5 sans-serif;
-		text-align: center;
-		vertical-align: .3em;
-		border-radius: 999px;
-		text-shadow: none;
-		box-shadow: 0 1px white;
-	}
-
-	.line-highlight[data-end]:after {
-		content: attr(data-end);
-		top: auto;
-		bottom: .4em;
-	}
-
-.line-numbers .line-highlight:before,
-.line-numbers .line-highlight:after {
-	content: none;
-}
-
-pre[id].linkable-line-numbers span.line-numbers-rows {
-	pointer-events: all;
-}
-pre[id].linkable-line-numbers span.line-numbers-rows > span:before {
-	cursor: pointer;
-}
-pre[id].linkable-line-numbers span.line-numbers-rows > span:hover:before {
-	background-color: rgba(128, 128, 128, .2);
-}