API Designer and API Explorer: update to Swagger UI 5.x and React 17.x #394
Description
API Designer and API Explorer currently swagger-ui 3.x which has fallen out of maintenance.
The current swagger-ui 5.x uses react 17.x, which probably means refactoring the two apps as react apps, and use https://www.npmjs.com/package/swagger-ui-react to embed swagger-ui.
Note: the website should then also switch to react 17.x, docusaurus 2.0.0-rc.1 can work with both react versions.