Implement Theming support through antd ConfigProvider

[rramaa]

https://ant.design/docs/react/customize-theme

As part of this task, we need to remove all of the colours used in the new design and only use the theme variables which can be for example:

1. colorPrimary
2. colorSecondary
3. borderRadius
4. {some custom variable name}

This way we would be able to provide custom thumbing support very easily and also would not need to override styles