[UI] Refactoring and improve secondary navigation

Problem/Motivation

According to the new design, the secondary nav should be refactored and added new behavior.

Steps to reproduce

N/A

Proposed resolution

Refactor JS code, and rewrite CSS according to the new design.

Remaining tasks

N/A

User interface changes

New design of the secondary navigation.

API changes

N/A

Data model changes

N/A