Fixes link after changes to the base repo

See merge request !79

Shows the bonus token key icon during the voting, the reading confirmation and the in the quiz results

Adds toast notification after the quiz round has finished when the attendee is able to use the bonus token

Adds updated installationguide

See merge request !77

Fixes proxy is not a function bug by using creatingProxyMiddleware function

See merge request arsnova/arsnova-click-v2-frontend!78

Adds guide that teaches step by step how to create a complete new theme with your own colors

See merge request arsnova/arsnova-click-v2-frontend!76

Adds new Documentation Folder and moves the Theme-Guide into it, adds preview build job to the guide

Adds env check to the ssr dev server if a proxy should be used. Adds readme description how to use the proxy ssr

Refactors subscription of quiz exchanges to use only one exchange and distinct messages by routing key