🎨 Refactor: existing styles to css-in-js with @emotion.

[Roshanjossey]

This comes from an action item in https://github.com/jina-ai/dashboard/discussions/127. We have made a decision to move to css-in-js to have atomic styles, to make it easy to use themes, make it easy to find and update styles.

The general idea is to the styles we currently have in css, scss files to css-in-js, use theming and improve, refactor our current emotion styles when needed

This issue will spawn multiple smaller issues. I'll keep track of them in a checklist below.

• [ ] 🎨 Use colors from theme palette in CommandBar.tsx
• [ ] 🎨 Use colors from theme palette in NodePort.tsx
• [ ] 🎨 Use colors from theme palette in HubOverviewActions.tsx

[jina-bot]

This issue is stale because it has been open 20 days with no activity. Remove stale label or comment or this will be closed in 4 days

[Roshanjossey]

Closing this in favour of #208