Add Docusaurus blog post about relaunching the app as a PWA.

Author: stesee

blog/2026-03-30-relaunch-app-as-pwa/index.md

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+---
+title: "Relaunch App as PWA"
+date: "2026-03-30"
+---
+
+Our application has undergone a relaunch, and we are excited to introduce the new features as a Progressive Web App (PWA). This approach ensures a smoother user experience and greater accessibility. 
+
+Read more about this at [Belegscan](https://belegscan.at).
+
+![Preview](image/index/belegscan-home.png)
+
+## New Features
+- Improved loading speed
+- Offline capability
+- Enhanced user interface
+- Push notifications
+- Better performance on mobile devices