♻️ 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/diff/CONTRIBUTING.md

@@ -1,28 +0,0 @@
-## Building and testing
-
-```
-yarn
-yarn test
-```
-
-To run tests in a *browser* (for instance to test compatibility with Firefox, with Safari, or with old browser versions), run `yarn karma start`, then open http://localhost:9876/ in the browser you want to test in. Results of the test run will appear in the terminal where `yarn karma start` is running.
-
-If you notice any problems, please report them to the GitHub issue tracker at
-[http://github.com/kpdecker/jsdiff/issues](http://github.com/kpdecker/jsdiff/issues).
-
-## Releasing
-
-Run a test in Firefox via the procedure above before releasing.
-
-A full release may be completed by first updating the `"version"` property in package.json, then running the following:
-
-```
-yarn clean
-yarn build
-yarn publish
-```
-
-After releasing, remember to:
-* commit the `package.json` change and push it to GitHub
-* create a new version tag on GitHub
-* update `diff.js` on the `gh-pages` branch to the latest built version from the `dist/` folder.