Now users can submit forms by hitting enter

[mainak9163]

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[N2D4]

Since this will capture all Enter presses on the page, this will cause weird behaviour if there are other things on the same page as the SignIn component. I believe the better way to do this is to have an <input type="submit" hidden> inside of a <form /> element, so we can use the default browser behavior. This should probably also be done on all the forms in stack-server.

@fomalhautb I believe you already built something like this? Can you combine it with this PR?

[mainak9163]

Okay!

[fomalhautb]

Moving to #57