fixed plotly with no error, fixed matplotlib legends

[py1sl]

minor fixes before tackling correct treatment of standard deviations

[shimwell]

Thanks for this, I normally merge into develop then main (gitflow) but I can see I've totally scrambled the recent branching.

[shimwell]

oh looks like my ci is broken as well

[shimwell]

I can fix the CI and rerun this in a few mins

[shimwell]

I've fixed the CI on the main branch, could you click the fetch upstream button on your fork please @py1sl it looks like this

[codecov]

Codecov Report

Merging #23 (fcd0da3) into main (18c2145) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##            main     #23   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          2       2           
  Lines         97      98    +1     
=====================================
- Misses        97      98    +1     

Impacted Files	Coverage Δ
spectrum_plotter/core.py	0.00% <0.00%> (ø)

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[shimwell]

Tests are passing and changes looks good thanks @py1sl