React console errors - upgrade to `@mui/material`

[Cafe137]

We have two type of errors which spam the browser console

One is a user error, where div is a descendant of p (e.g. ExpandableListItem)

And the other comes from the old mui using deprecated React API (e.g. Collapse API)

https://mui.com/material-ui/migration/migration-v4/

I propose the upgrade to 5 and an overhaul of the Expandable* components which contain this mistake in multiple places