Nothing
The icosa package implements triangular tessellation to refine regular icosahedra in 3d space - which can be used as horizontal grids, such as this:
{R, fig.out=8, fig.width=4}
library(icosa)
gr <- hexagrid(deg=10, sf=TRUE) # create grid
plot(gr)
To make the package as small as possible, the tutorials on how to use the package are available at the package website:
https://icosa-grid.github.io/R-icosa/
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.