Review pkgdown website (& then link it from replication hub)

[LukasWallrich]

@LukasRoeseler I created a pkgdown website for the package that is automatically updated from the documentation. https://forrt.org/FReD/. Could you have a look through, and if you think it's clean enough then we can add it to the replication hub links.

Once we have tutorials for the shiny apps, they can then also easily be included as vignettes here - to be discussed in due course.

[LukasRoeseler]

@LukasWallrich The entire thing looks just wonderful, thank you for creating it! I think it is clean enough to add it to the replicatino hub. Can you do that?