Implement SSR using Angular Universal, enable reverse-proxy cache in nginx configuration

[wiz]

https://blog.angular-university.io/angular-universal/

https://medium.com/platformer-blog/enabling-server-side-rendering-on-an-existing-angular-application-with-angular-universal-5fdf7549b928

[softsimon]

• [x] Merge new init-api to master
• [x] Go through all pages and make sure they are pre-renderable (fix document, window, setTimeout etc)
• [ ] Make unique URLs for tabs and paginations
• [x] Support the "generated config" for the correct network dropdown menu
• [ ] Investigate if it's possible to pre-render the chartist graph on the backend
• [ ] Add TransferHttpCacheModule and enable transfer of data to remove the "flickering" and double loading
• [x] Make API url's configurable on the frontend AND server.ts universal backend
• [ ] Support and proxy other networks than mainnet