Start switch to react-icons

[entrotech]

Fixes #1682

What changes did you make?

• Determined that we can use any of several sets of free icons without impact to the bundle size.
• Migrated the icons on the CheckListModal and About page to use react-icons instead of importing @FortAwesome. These are the exact same icons, but just us a different import mechanism.
• We could follow-up by changing the import of all the @FortAwesome icons in the app, or wait for design to decide what icons they want to use.

Why did you make the changes (we will use this info to test)?

• Per request by UI Design to use an icon set with a larger number of available icons.

Issue-Specific User Account

(none)

Screenshots of Proposed Changes Of The Website (if any, please do not screen shot code changes)

n/a