Font Awesome and Material Design Icons are both being used

[Nightsphere]

There are currently two icon packages being used by the Infomapper/Common library: Font Awesome version 4 and Material Design Icons. It seems a little redundant to have both being used. I feel like one can be removed, as they both contain a good amount of icons, and don't really have something that the other doesn't.

Some red flags I've found with the Material Design Icons package is:

• The package exists in a weird state on npmjs.com; The package hasn't been updated for over 5 years. On the other hand, maybe it just has all the icons it will ever have, but that also means it will never get any new icons. It also won't show up when searched on the site, I had to Google npm material-design-icons and finally got to the page.
• Installing and uninstalling takes a long time, as in more than a reasonable amount of time for 1 package. This might have to do with the fact that is hasn't been updated in a while and is using antiquated methods/isn't compressed/etc.

I didn't really see anything inherently wrong with Font Awesome. Version 4 is currently installed, with version 5 being the most current version out, and 6 on the way. As long as the version contains all that the Infomapper needs, staying with version 4 might be okay, but I'll look into upgrading and see what that entails.

[Nightsphere]

I believe npm i @fortawesome/fontawesome-free will download version 6 of font awesome, the latest version out right now. It provides around 1,700 free icons, compared to the 675 that version 4 offers, which is what the Infomapper is currently using. I'm not sure if it's backwards compatible, so I'll have to check that.