🎨 Use colors from theme palette in NodePort.tsx

[Roshanjossey]

The file that should be updated is https://github.com/jina-ai/dashboard/blob/master/src/components/FlowChart/NodePort.tsx

In components like NodePort and NodePortInner, colors are hard-coded. Change this to use color from theme.

For example, Change

  const NodePortInner = styled.div`
    background-color: #099;
    color: white;
    border-radius: 0.25rem;
    width: 0.5rem;
    height: 0.5rem; ;
  `;

to

  const NodePortInner = styled.div`
    background-color: ${(props) => props.theme.palette.primary};
    color: ${(props) => props.theme.palette.background};
    border-radius: 0.25rem;
    width: 0.5rem;
    height: 0.5rem; ;
  `;

[Roshanjossey]

Closing this in favour of #210