Added example of reading input file for unoptimized config in 0D solver docs

[alexkaiser]

It was unclear that the json must be opened then passed to the calibrator. Added instructions for reading that file accordingly.

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[ktbolt]

@alexkaiser The calibrate function input argument is a Python object, does not need to be read in from a file. The my_unoptimized_config = {...} statement does demonstrate this but it is not very informative.

The svZeroDCalibrator - Quick User Guide should be reorganized to first describe what it does and what data it uses (config file). And after that show an example for Python and C++ how to use calibrate.

[ktbolt]

@alexkaiser And an Issue should have been opened for this.

[alexkaiser]

Okay, please feel free to discard the pull request and change otherwise, for minor changes will open an issue in the future.

[ktbolt]

@alexkaiser Thanks for bringing this problem to our attention!

I have opened an Issue for it.