Clean unneeded and deprecated dependencies

[Lectem]

Due to some packages such as regl/splom, plotly.js makes us download/use uneeded and deprecated dependencies such as left-pad while they are not even needed. (See gl-vis/regl-splom#18)

When installing through npm I get the following warnings:

npm WARN deprecated os-homedir@2.0.0: This is not needed anymore. Use require('os').homedir() instead.
npm WARN deprecated left-pad@1.3.0: use String.prototype.padStart()

I think it would do good to the project to clean such dependencies.

[archmoj]

Addressed by #5084.