Nested comments

[amyhuycu]

What did you implement/accomplish in this pull request?
Give a short summary of what you completed in the pull request.
This is for issue #96

This allows logged in users to post comments under existing comments by clicking the Reply To option.
The users who are not logged in will receive a message that reminds them to log in.

Backend Checklist

• Tested edited/created routes
• Make sure that all tests pass with flask test
• Resolve all comments made
• Remove any unecessary/commented code

Frontend Checklist

• Tested that components can be flexible with different view formats (Desktop, tablet, mobile)
• npm run build does not create any errors
• Resolve all comments made
• Remove any unecessary/commented code

[vercel]

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[bryanwong8]

When the comment is made the editor should close