Allow for linkable symbols in the documentation site
I'd like a way to link to set symbols via URL, so that you could point directly to `andrewgioia.github.io/Keyrune/icons/mmq` and go to the `icons.html` page with a large preview of the Mercadian Masque symbol.

This should also be what shows in a modal when you click on one of the icons on the `icons.html` page as well. Currently all it does is hover and make the icon slightly larger.