Make `prosemirror-math` work in Collaborative Editing Environments

[benrbray]

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At the moment, prosemirror-math is not designed with collaborative editing in mind. In the future, care should be taken to ensure it is as easy as possible to use prosemirror-math as a drop-in plugin for collaborative editing environments.

• I hope to use Fidus Writer as a case study of sorts to see if it is possible to use prosemirror-math in a collaborative environment.