Wiki: bottom page navigation, add child page and printer friendly

[jrosgiralt]

In Labdoo 2.0, at the bottom of each wiki page we can (1) Navigate to the next or previous pages, (2) Create a child page and (3) produce a printer friendly view:

For instance:

https://platform.labdoo.org/content/labdoo-roll

This also needs to be added in Labdoo 3.0 as it's very useful.