Show connected SSID

ampel-firmware/ampel-firmware.ino

@@ -163,7 +163,9 @@ void loop() {
 void wifiConnected() {
   led_effects::showKITTWheel(color::green);
   Serial.println();
-  Serial.print(F("WiFi - Connected! IP address: "));
+  Serial.print(F("WiFi - Connected to "));
+  Serial.print(WiFi.SSID());
+  Serial.print(F(", IP address: "));
   IPAddress address = WiFi.localIP();
   snprintf(wifi::local_ip, sizeof(wifi::local_ip), "%d.%d.%d.%d", address[0], address[1], address[2], address[3]);
   Serial.println(wifi::local_ip);