Website restoration: Node.js backend, restored design, GitHub sync disabled

- Replaced broken .NET backend with Node.js/Express
- Restored original website design with purple gradient hero
- Updated homepage and shop pages with Bootstrap 5 responsive design
- Disabled GitHub remote sync - all code now stored locally only
- Created backup scripts and documentation
- All changes saved on Ubuntu server at /var/www/SkyArtShop

backend/node_modules/uuid/CONTRIBUTING.md

@@ -0,0 +1,18 @@
+# Contributing
+
+Please feel free to file GitHub Issues or propose Pull Requests. We're always happy to discuss improvements to this library!
+
+## Testing
+
+```shell
+npm test
+```
+
+## Releasing
+
+Releases are supposed to be done from master, version bumping is automated through [`standard-version`](https://github.com/conventional-changelog/standard-version):
+
+```shell
+npm run release -- --dry-run  # verify output manually
+npm run release               # follow the instructions from the output of this command
+```