Made the hop histogram better

[JimmyRushing]

the plot_stacked_hist_rates() in kmc_analyze.py had the small font and primary colors that didn't have the ambiance that a nice plot like this deserves.

[codecov]

Codecov Report

Merging #44 (a487528) into master (aa7cbd3) will decrease coverage by 0.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   84.98%   84.37%   -0.62%     
==========================================
  Files           9        9              
  Lines         766      768       +2     
==========================================
- Hits          651      648       -3     
- Misses        115      120       +5     

Impacted Files	Coverage Δ
morphct/kmc_analyze.py	77.27% <ø> (ø)
morphct/execute_qcc.py	81.29% <0.00%> (-2.93%)	⬇️
morphct/helper_functions.py	84.33% <0.00%> (-0.19%)	⬇️
morphct/mobility_kmc.py	90.15% <0.00%> (ø)

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