Use importmaps for fontawesome

[mikevallano]

Seems like a bit of an undertaking: https://stackoverflow.com/questions/71430573/can-font-awesome-be-used-with-importmaps-in-rails-7

and perhaps we want to use google icons instead?

ref: #391

[lortza]

It does look like an undertaking, but maybe it's a good learning experience? I'm also glad to switch over to material icons. We can even use the icon component from my other project if we want to. See #347