feat(app): add prerender, self-hosted fonts and privacy page

Fonts come from npm, not Google, so no third-party font requests.
Pages are prerendered at build time; browser-only code is guarded.
nginx serves per-route HTML, a real 404 and gzip.

README.md

@@ -6,7 +6,7 @@ multi-language support (EN/DE) via **ngx-translate**.
 
 The app is built as a static **Single Page Application (SPA)** served by **NGINX**,
 deployed at:
-👉 [https://app.andreas-dahm.eu](https://app.andreas-dahm.eu)
+👉 [https://andreas-dahm.eu](https://andreas-dahm.eu)
 
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@@ -138,7 +138,7 @@ docker compose pull
 docker compose up -d
 ```
 
-✅ Live site at https://app.andreas-dahm.eu
+✅ Live site at https://andreas-dahm.eu
 
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