Fix README and other minor documentation updates.

[spensonshih]

Updating README and other minor documentation updates.

Before submitting this pull request, please ensure that the following criteria have been met:

• [X] All automated tests have passed successfully.
• [X] All manual tests have passed successfully.
• [X] Code has been reviewed by at least one other team member.
• [X] Code has been properly documented and commented as needed.
• [X] All new and existing code adheres to our project's coding standards.
• [X] All dependencies have been added or removed from the project's README or other documentation as needed.
• [X] Any relevant documentation or help files have been updated to reflect the changes made in this pull request.
• [X] Any necessary database migrations have been run.
• [X] Any relevant UI changes have been reviewed and approved by the UI/UX team.