♻️ 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-docker/index.js

@@ -1,29 +0,0 @@
-import fs from 'node:fs';
-
-let isDockerCached;
-
-function hasDockerEnv() {
-	try {
-		fs.statSync('/.dockerenv');
-		return true;
-	} catch {
-		return false;
-	}
-}
-
-function hasDockerCGroup() {
-	try {
-		return fs.readFileSync('/proc/self/cgroup', 'utf8').includes('docker');
-	} catch {
-		return false;
-	}
-}
-
-export default function isDocker() {
-	// TODO: Use `??=` when targeting Node.js 16.
-	if (isDockerCached === undefined) {
-		isDockerCached = hasDockerEnv() || hasDockerCGroup();
-	}
-
-	return isDockerCached;
-}