Read only Webhook ID property

Amended some documentation.

resources/settings/properties.xml

@@ -15,15 +15,6 @@
 <properties>
   <property id="api_key" type="string"></property>
 
-  <!--
-    The webhook ID is the last part of the webhook URL.
-    It is secret and should not be shared.
-    It will not be set in settings but will be
-    generated by the application and stored in
-    persistent storage.
-  -->
-  <property id="webhook_id" type="string"></property>
-
   <!--
     Internal URL "https://homeassistant.local/api"
     External URL "https://<dynamic DNS>/api"
@@ -89,4 +80,13 @@
   -->
   <property id="battery_level_refresh_rate" type="number">15</property>
 
+  <!--
+    The webhook ID is the last part of the webhook URL.
+    It is secret and should not be shared.
+    It will not be set in settings but will be
+    generated by the application and stored in
+    properties, but read only for trouble shooting.
+  -->
+  <property id="webhook_id" type="string"></property>
+
 </properties>

resources/settings/settings.xml

@@ -109,8 +109,8 @@
 
   <setting
     propertyKey="@Properties.webhook_id"
-    title="Webhook ID"
+    title="@Strings.WebhookId"
   >
-    <settingConfig type="alphaNumeric" />
+    <settingConfig type="alphaNumeric" readonly="true" />
   </setting>
 </settings>

resources/strings/strings.xml

@@ -59,4 +59,5 @@
     <string id="SettingsWidgetStart">(Widget only) Automatically start the application from the widget without waiting for a tap.</string>
     <string id="SettingsEnableBatteryLevel">Enable the background service to send the clock battery level to Home Assistant.</string>
     <string id="SettingsBatteryLevelRefreshRate">The refresh rate (in minutes) at which the background service should repeat sending the battery level.</string>
+    <string id="WebhookId">(Read only) The Webhook ID created by the watch for battery level updates. You might require this for debugging.</string>
 </strings>