Pico W Support (#137)

* Refactor code to support Pico W board

* Updates for Pico W support

* Update based on changes in CircuitPython v8.0.0 beta 6

* Updated bundle download to 8.x, fixed a few typos

* Updating documentation for web interface

* Update support for CircuitPython 8.0.0, fix many bugs

* Document multiple payload options

* Update copyright dates

* Fixed typo