test: Add cypress tests for the happy path. (Fixes #42)

[mmcknett]

Initial Cypress tests

This is the initial set of cypress tests, running against the firebase emulators. My initial test plan ended up looking like this:

1. Create an account
2. Log out
3. Log in with the account just created
4. Create a draft a. Check that the draft exists on firebase
5. Make a note and submit it a. Make sure the note appears on the page. b. Check that firebase has a note, too.
6. Delete the note

Followup

Some things that should get broken out separately:

• [x] Verify that Delete Draft resets the form properly. (#44)
• [x] Make sure that default list handling is as expected. (#45) a. The default list should be used if a note is drafted without adding a list. Applies to draft and saved note. b. The last-used list should be used if a note has been previously submitted and no list is added by the user. c. The list added by the user is used otherwise. d. The last-used list updates whenever a note is submitted.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 12d0a78):

https://loggr-a3f89--pr43-cypress-f3lvgtew.web.app

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[mmcknett]

I wanted to see if I could get the cypress tests to check Firestore instead of sensing whether the database had been updated via UI updates. It didn't go well; using the firebase client SDK (e.g. calling getDoc(...)) via Cypress is flakey. Integrating with cypress-firebase was a mess, too, because it's hard to keep track of the uid for the newly-created user. For now, I'm leaving it as is.