check and clean up dependencies

[gvwilson]

plotly.js ->
https://www.npmjs.com/package/fast-isnumeric ->
https://www.npmjs.com/package/is-string-blank which it appears @archmoj broke out in order to use separately in https://www.npmjs.com/package/gl-scatter3d, but it also has a couple of non-plotly dependents like https://www.npmjs.com/package/is-string-and-not-blank

[chaigh-uk]

The repo for is-string-blank (as listed on npm) seems to be missing. @archmoj / @alexcjohnson do you know if this has moved location or can be restored?

[gvwilson]

@chaigh-uk https://github.com/plotly/is-string-blank had been made a private archived repo - I've changed the visibility to public. Please let me know if that does what you need - thanks @gvwilson

[chaigh-uk]

@gvwilson that's great!! Thanks for picking this up so quickly!