consider adding static versions of the charts in the README

[cjyetman]

README does not support including interactive JavaScript versions of the charts, but we could include static images of them so a user can quickly see what the intended output should look like, and then could point to the Articles/vignettes on the pkgdown site to see functioning interactive versions that are here: https://2degreesinvesting.github.io/r2dii.interactive/articles/

AB#10884

[cjyetman]

or possibly an animated GIF showing some of the interaction