Release version 2.5.0

Major features:
* Evaluation of free text answers
* The flashcards UI has been overhauled. They are now handled separately
  from questions.
* Question duplication and import from other sessions

Minor features and changes:
* The number of comments is now shown in presentation mode
* New use case including only comments
* Export of answer statistics to CSV format
* Export of questions to format
* Export/import of flashcards to/from format
* Proxy support for WebSocket connections
* Reduced the amount of API requests sent
* Usability improvements and bug fixes

With this release we have completely overhauled our
[documentation]( Additionally, we now provide
[Docker images](
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