This command will allow users to resolve mismatches in default values
between sdkconfig and Kconfig according to a policy specified:
* sdkconfig: Using default values from sdkconfig (backward compatible)
* interactive: User can choose the source for every affected config
option separatedly
* kconfig: Using default values from Kconfig
* Project Configuration Guide: how to configure the project, purpose of
sdkconfig.defaults, where is the configuration stored...
* Component configuration: how to write Kconfig files, how to ensure
backward compatibility...
Also, general information about Kconfig and its files was added. Other parts of the
documentation (e.g. build-system) now point to these new guides in order
to provide more info.