Add deployment pipeline with Fly.io setup

- Introduced `.woodpecker.yml` for CI/CD pipeline configuration targeting `main` branch.
- Added `fly.toml` for Fly.io deployment settings, including region and deployment checks.
- Created a `Dockerfile` for serving static files via NGINX with SPA routing setup.

Dockerfile

@@ -0,0 +1,18 @@
+FROM nginx:alpine
+
+# Kopiere statische Dateien ins Nginx-Verzeichnis
+COPY src/ /usr/share/nginx/html/
+
+# Konfiguriere NGINX für Single-Page-Applications (optional)
+RUN echo 'server { \
+    listen 80; \
+    root /usr/share/nginx/html; \
+    index index.html; \
+    location / { \
+        try_files $uri $uri/ /index.html; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]