feat: use bg-mpl-stylesheets colors in plots

[sbillinge]

closes #74

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.10%. Comparing base (ce00937) to head (28de205).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files          23       23           
  Lines        1123     1123           
=======================================
  Hits         1068     1068           
  Misses         55       55           

[sbillinge]

@Tieqiong , @bobleesj please can you review?

[bobleesj]

double checked:

bg_blue = "#0B3C5D"
bg_red = "#B82601"
bg_green = "#1C6B0A"

lgtm!