Introduce discussion & history pages for algorithms.

[KlosFabian]

For easier collaboration and page recovery.

[fakepk]

Discussion Threads is a feature on the roadmap and history of pages, aka content versioning, is another. Thus we split this ticket into two.

[fakepk]

@KlosFabian The first version of feature for discussing content on the platform is now live. Please give it a try and give feedback. As mentioned above I split this ticket into two by creating a separate one for history pages (#36), thus I close this one here.