Add a page descritpion to the wizard receiver page

src/css/defaults_dialog.css

@@ -53,6 +53,12 @@
     display: inline-block;
 }
 
+.defaults-dialog__wizard p {
+    margin-top: 1em;
+    font-size: 0.9em;
+    color:#444;
+}
+
 .defaults-dialog__content--wrapper {
     overflow-y: auto;
 }

wizard/receiver.html

@@ -1,4 +1,8 @@
 <h2>Receiver wizard</h2>
+<p>
+    Configure receiver serial port and protocol. If you unsure about serial port or protocol, click `Skip` to go to the next page.
+    You can change those settings later with the configurator UI.
+</p>
 <div>
     <label for="wizard-receiver-port">Receiver Serial Port</label><select id="wizard-receiver-port"></select>
 </div>