[Feature] Allow generating chart images on serverside. (node.js)

[itzTheMeow]

Feature Description

Currently the library only works in the browser. It would be cool if the library could be used to generate a static chart image in nodejs too.

To Do

maybe a separate function to generate an image, with parameters for screen height/width, what timeframe to show on the chart, zoom level, and the data to show on the chart

[liihuu]

It's too difficult to use some browser specific APIs.