Adding MUI font and icons to index.html

[jasonvasquez]

MaterialUI by default uses Roboto and the Material Icons. This change introduces those two resources to the template index.html.

[abillingsley]

I am honestly a little torn on this. This is super simple but does have the potential disadvantage that we are dependent on the external cdn for the app to look right (google should be up but what if it isn't).

Thoughts on using something like this https://github.com/fontsource/fontsource to include these fonts in the bundle?

//fonts.ts

import "fontsource-roboto";
import "fontsource-material-icons";

theme.ts

import "./fonts";

// do material theme things