♻️ 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/match-braces/prism-match-braces.css

@@ -1,29 +0,0 @@
-.token.punctuation.brace-hover,
-.token.punctuation.brace-selected {
-	outline: solid 1px;
-}
-
-.rainbow-braces .token.punctuation.brace-level-1,
-.rainbow-braces .token.punctuation.brace-level-5,
-.rainbow-braces .token.punctuation.brace-level-9 {
-	color: #E50;
-	opacity: 1;
-}
-.rainbow-braces .token.punctuation.brace-level-2,
-.rainbow-braces .token.punctuation.brace-level-6,
-.rainbow-braces .token.punctuation.brace-level-10 {
-	color: #0B3;
-	opacity: 1;
-}
-.rainbow-braces .token.punctuation.brace-level-3,
-.rainbow-braces .token.punctuation.brace-level-7,
-.rainbow-braces .token.punctuation.brace-level-11 {
-	color: #26F;
-	opacity: 1;
-}
-.rainbow-braces .token.punctuation.brace-level-4,
-.rainbow-braces .token.punctuation.brace-level-8,
-.rainbow-braces .token.punctuation.brace-level-12 {
-	color: #E0E;
-	opacity: 1;
-}