♻️ 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/is-inside-container/index.js

@@ -1,23 +0,0 @@
-import fs from 'node:fs';
-import isDocker from 'is-docker';
-
-let cachedResult;
-
-// Podman detection
-const hasContainerEnv = () => {
-	try {
-		fs.statSync('/run/.containerenv');
-		return true;
-	} catch {
-		return false;
-	}
-};
-
-export default function isInsideContainer() {
-	// TODO: Use `??=` when targeting Node.js 16.
-	if (cachedResult === undefined) {
-		cachedResult = hasContainerEnv() || isDocker();
-	}
-
-	return cachedResult;
-}