Implemented automatic refresh of tracked URLs

[junwenzh]

Pull Request Template

Description

Implemented automatic refresh of tracked URLs. Run the file refresh.js. This will invoke api/refresh at interval.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?