add giessomat state

lights/index.html

                             <p>Unknown</p>
                         </div>
                     </div>
+
+                    <div class="row">
+                        <div class="col text-end">
+                            <p>Giess-o-mat</p>
+                        </div>
+                        <div class="col text-start" id="giessomat">
+                            <p>Unknown</p>
+                        </div>
+                    </div>
                 </div>
 
                 <!-- Help Tab Panel -->

lights/lights.js

 subscribeSensor("livingroom/pressure", "mbar", "#livingpress", 100.0)
 subscribeSensor("livingroom/tvoc", "ppb", "#livingtvoc")
 subscribeSensor("livingroom/eco2", "ppm", "#livingeco2")
+
+subscribeSensorString("giessomat", "#giessomat")

lights/mqtt.js

     })
 }
 
+function subscribeSensorString(topic, selector) {
+    subscribeTopic(topic, function (msg) {
+        const txt = document.querySelector(selector)
+        txt.innerHTML = "<p>" + msg + "</p>"
+    })
+}
+
 function setTopic(topic, message) {
     console.log("Tx \"" + topic.toString() + "\": \"" + message.toString() + "\"")