optimized ui a little bit and added impressum

src/app/shared/SharedFunctions.ts

@@ -0,0 +1,10 @@
+
+export class SharedFunctions {
+  static openMail(event?: Event) {
+    event?.preventDefault();
+    const user = 'andreas.dahm';
+    const domain = 'gmail.com';
+    globalThis.location.href = `mailto:${user}@${domain}`;
+  }
+
+}