Event fixes

[camdendotlol]

Summary

• updates the event PUT endpoint to search for pages linked to an updated event to update their titles
• fixes flexbox formatting issues on the event form page that led to some form elements being all over the screen on a smaller (e.g. laptop) display
• adds onSubmit handling to the event form for the new is_offline AV file attribute to account for the fact that it's stored as a string in form state but as a boolean in the JSON
  • this addresses some bad logic where is_offline was being checked for truthiness, but the string "false" will resolve to true

Closes #79

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