Apply Redesign Platform-wide

[ifirmawan]

Is your feature request related to a problem? Please describe.
While migrating the platform to the next JS framework, we also need to align the existing component with a new UI Kit.

Describe the solution you'd like
The new style base is only activated when using the which is on a conditional switch from _app.jsx
Therefore we'd gradually enable the for each view and:

• apply typography, colors, buttons, and other components (if applicable)
• Fix any visual issues

TODO/DONE

• Sign-in modal
• Onboarding
• Knowledge library
• Resource view
• Community
• Experts