function for generating trials & binding to reset group button

[wasita]

currently, we're hard-coding trials into the firestore database, but ideally in the future should have a function in utils that generates a trial sequence (list of possible endowments). this function should also be called when a user presses the 'reset group' button

[wasita]

can initialize trials like so, in saveName() in utils.js:

      updateData['trials'] = Array.from({ length: 3 }, (_, index) => ({
        endowment: 10,
      }));

[wasita]

though would need to be put in different function if want to bind to resetGroup button too