feat/edit cypress and error handling

[amysiu1028]

What I did:

• cypress testing

• error handling

• changed movie title path to movie/:id

• Did this break anything?

• [x] No

• [ ] Yes

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [ ] Styling
• [x] Bug fix (non-breaking change which fixes an issue)
• [x] Refactor(DRY-ing up/ reorganizing code, etc.)
• [x] Super small fix (Corrected a typo, removed a comment, etc.)
• [ ] Skip all the other stuff and briefly explain the fix.

Checklist:

• [x] If this code needs to be tested, all tests are passing
• [x] The code runs locally
• [ ] There are comments where clarification/ organization is needed
• [ ] The code is DRY. If it's not, I tried my best
• [x] I reviewed my code before pushing

✨ What's next?

• resolve any merge conflicts
• responsive design: waiting on approval