Auto icon image generator

[jerriclynsjohn]

Added a script yarn image or npm run image that will autogenerate an index.html and heroIcons.png that shows the name of the icon file along with the icon, this increases the searchability of the icon in the repo. Any future icons can be automatically be added by just running the script before commit.

[jerriclynsjohn]

@sschoger I hope this is a useful addition for everyone.