Add popover explainer for scatterplots options.

[jsoules]

Fix #91.

Adds an info icon which, when clicked, pops up a small text explaining what the scatterplot options mean.

Originally I was going to use a direct tooltip, but the react-tooltip module seemed a little finicky. In particular, the tooltip was always getting hidden by the graphs if any graphs were displayed (regardless of what I did with the z-index).

[codecov-commenter]

Codecov Report

Merging #94 (848fc40) into main (ef52102) will decrease coverage by 0.14%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   16.15%   16.02%   -0.14%     
==========================================
  Files          80       80              
  Lines        5854     5905      +51     
  Branches      138      138              
==========================================
  Hits          946      946              
- Misses       4908     4959      +51     

Flag	Coverage Δ
gui_units	20.48% <0.00%> (-0.24%)	:arrow_down:
svc_units	2.27% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/tabs/ScatterplotsTab.tsx	0.00% <0.00%> (ø)

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[magland]

@jsoules When you have a chance could you deploy this to dev folder so I can see it in action? Or if you are confident it is not breaking anything, you can go ahead and merge (the code looks fine to me).

[jsoules]

When you have a chance could you deploy this to dev folder so I can see it in action?

Sure thing! I've deployed and it should be up as soon as github-pages refreshes.

[magland]

Looks great!

[jsoules]

Sounds good! I'll get that merged & published.