added ust idnr

Author: tsukinoko-kun

src/pages/impressum.astro

@@ -20,6 +20,8 @@ import Card from "../components/Card.astro";
     <p>Ludwig-Erhard-Str. 18</p>
     <p>20459 Hamburg</p>
     <br />
+    <p>USt-IdNr. <code>DE453006444</code></p>
+    <br />
     <p>Vertreten durch: Frank Mayer, René Ott</p>
     <br />
     <h2 class="text-xl font-bold">Kontaktdaten</h2>