DOC: nicer CMake example

This updates the CMake example with several improvements.
* The modern CLI usage (3.14+) is used for configurting and building (plain CMake and scikit-build examples)
* Removed CXX variable setting (not a CXX project)
* Ensured Python 3.7+ is discoverd, and also avoid requiring Development.Embed (component not present in some places like manylinux)
* Nicer include directory listing
* Drop unused varaible
* Use FindPython's integrated module support
* Avoid directory-level settings, use only target level settings instead (as noted in the orignal comment - also this was originally directory scope, not project scope)

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