Add '.example' files. (#2257)
* Add '.example' files.
Ref: #2232, add platformio_override.ini.example and custom.h.example files.
* Delete custom.h.example
* Delete platformio_override.ini.example
* Add files via upload
* Add files via upload
* Update custom.h.example
* Update custom.h.example
* Update platformio_override.ini.example
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