Add led pin setting

src/templates/index.html

@@ -100,6 +100,16 @@
                 />
                 <input type="submit" value="Update Number of LEDs" />
             </form>
+            <form id="led_pin_form" method="post" action="/led_pin">
+                <label for="num_leds">Led pin:</label>
+                <input
+                    type="text"
+                    id="led_pin"
+                    name="led_pin"
+                    value="{{settings['led_pin']}}"
+                />
+                <input type="submit" value="Update Led Pin" />
+            </form>
             <p>Mac address: {{mac}}</p>
         </div>
         <div id="connection-status"></div>