The three doc sites (https://doc.ezplatform.com, https://doc.ezplatform.com/projects/ezservices and https://doc.ezplatform.com/projects/userguide) are connected as subprojects in ReadTheDocs, but there is no easy way to jump between them.

We could use some sort of navigation (a horizontal menu at the top for example) that would contain links to all three sites.

For added bonus points: the links should lead to the correct doc version, for example when I am in the 1.7 version of developer doc I would like to jump directly to 1.7 of user doc and not the default branch. (ezservices will not versioned, at least in the foreseeable future).