♻️ 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
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✅ 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-plain-obj/index.d.ts

@@ -1,35 +0,0 @@
-/**
-Check if a value is a plain object.
-
-An object is plain if it's created by either `{}`, `new Object()`, or `Object.create(null)`.
-
-@example
-```
-import isPlainObject from 'is-plain-obj';
-import {runInNewContext} from 'node:vm';
-
-isPlainObject({foo: 'bar'});
-//=> true
-
-isPlainObject(new Object());
-//=> true
-
-isPlainObject(Object.create(null));
-//=> true
-
-// This works across realms
-isPlainObject(runInNewContext('({})'));
-//=> true
-
-isPlainObject([1, 2, 3]);
-//=> false
-
-class Unicorn {}
-isPlainObject(new Unicorn());
-//=> false
-
-isPlainObject(Math);
-//=> false
-```
-*/
-export default function isPlainObject<Value>(value: unknown): value is Record<PropertyKey, Value>;