♻️ 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-numbers/prism-line-numbers.css

@@ -1,40 +0,0 @@
-pre[class*="language-"].line-numbers {
-	position: relative;
-	padding-left: 3.8em;
-	counter-reset: linenumber;
-}
-
-pre[class*="language-"].line-numbers > code {
-	position: relative;
-	white-space: inherit;
-}
-
-.line-numbers .line-numbers-rows {
-	position: absolute;
-	pointer-events: none;
-	top: 0;
-	font-size: 100%;
-	left: -3.8em;
-	width: 3em; /* works for line-numbers below 1000 lines */
-	letter-spacing: -1px;
-	border-right: 1px solid #999;
-
-	-webkit-user-select: none;
-	-moz-user-select: none;
-	-ms-user-select: none;
-	user-select: none;
-
-}
-
-	.line-numbers-rows > span {
-		display: block;
-		counter-increment: linenumber;
-	}
-
-		.line-numbers-rows > span:before {
-			content: counter(linenumber);
-			color: #999;
-			display: block;
-			padding-right: 0.8em;
-			text-align: right;
-		}