Upgrade MUI to V5 and fix a bunch of bad code

[haihan-lin]

Does this PR close any open issues?

Closes #225

Give a longer description of what this PR addresses and why it's needed

• Upgrade MUI (some of the "lab" features have been added to the official library).
• changed package manager from NPM to YARN
• New styling engine Emotion instead of Styled-Components
• Move dialog state management out of global state, into parts that actually trigger the dialog.

Provide pictures/videos of the behavior before and after these changes (optional)

Should all look the same with some minor aesthetic change

TODO

• another thorough testing making sure no broken features

[JackWilb]

I didn't dig too deep into the code changes, but the ones I looked at seemed to not be a problem. I have one note about yarn, but it shouldn't hold up merging

[JackWilb]

It's strange to have yarn here. We should probably just switch over to yarn fully, and remove package-lock.json, if that's what you'd like to use to manage the packages

[haihan-lin]

can you help me on making sure to clean up these? thank you very much

[JackWilb]

See 3186ff7