[Tech Debt]: migrate /account tabs to react-icons assets

[emilydrakesmith]

What is needed?

Most of the icons used in the PortfolioTabs.tsx file are hosted locally in the app although they all appear to be assets from the react-icons package. If there's a compelling reason to use this pattern we should add comments to the file explaining such and host the <FaMedal /> image similarly. If not, we should migrate asset sourcing in the file to react-icons and delete the assets from the /src directory.

Neither implementation is inherently better but we should have a consistent source for all icons being used in the file.