Change GPIO nodes to use BCM rather than pins

hardware/PiGpio/locales/en-US/36-rpi-gpio.html

@@ -1,18 +1,3 @@
-<!--
-  Copyright JS Foundation and other contributors, http://js.foundation
-
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-  http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
--->
 
 <script type="text/html" data-help-name="rpi-gpio in">
     <p>Raspberry Pi input node. Generates a <code>msg.payload</code> with either a