Documentation: Enhancement to Difficulty Index use-case documentation

[hertneky]

Describe the Enhancement

Documentation-only enhancement
Enhance the existing documentation for the Difficulty Index use-case.
Include description of the weighting function, which is defined by the user in the embedded python scripts.

Time Estimate

<1 day

Sub-Issues

None

Relevant Deadlines

none

Funding Source

NOAA WPC

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[hertneky]

The documentation of the Difficulty Index was moved to METcalcpy #332.

A small modification to the use-case in METplus will point to the external documentation about the algorithm and additional plotting capabilities.