Show a QRCode and status on the M5Stack's display (#890)

* Add display support for the ESP32

* Attempt to use real payload

* Restyled by clang-format

* Leave the DevKit-C as the default device

* Fix the ESP build in CI

* Update docs

* Restyled by prettier-markdown

* Minor tweak to docs

* Restyled by prettier-markdown

* Fix missing word in doc

Co-authored-by: Restyled.io <commits@restyled.io>