Upgrade to the Latest MUI #575
Description
This might be big...
Upgrade React and MUI to the latest versions. You'll likely need to fix a whole lot of things along the way. If it is easier to upgrade one and then the other then feel free to make multiple pull requests.
Try to upgrade as many other dependencies as you go.
If you hit a wall then the brute force way to do this is:
rename the frontend directory
use create react app to make a new frontend app
install all the things
copy things back in piece by piece
Just shout if that is your approach, we'll need to keep an eye out for git chaos