theme & styleguide

## `@todo`
* [ ] enable smartcontract-ui theming
* [ ] improve UI/UX of smartcontract-ui and make a new theme
    * https://www.loom.com/share/eda49b7304bf4e568b83f90d4b99a813

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Make it possible for users to use different themes
https://oneclickdapp.com/oscar-dynasty/

