Create hexagon grid

Wraps the [react-hexgrid](https://www.npmjs.com/package/react-hexgrid) library.

reacthexgrid(width = NULL, height = NULL, elementId = NULL)

Arguments

width	Fixed width for widget (in css units). The default is NULL, which results in intelligent automatic sizing based on the widget's container.
height	Fixed height for widget (in css units). The default is NULL, which results in intelligent automatic sizing based on the widget's container.
elementId	Use an explicit element ID for the widget (rather than an automatically generated one). Useful if you have other JavaScript that needs to explicitly discover and interact with a specific widget instance.