Yes, those templates have been removed. We are focusing on IoT development. Please see the release notes > https://software.intel.com/en-us/xdk/docs/release-notes-information-intel-xdk < for more information. That version of the XDK is not likely to work at all anymore, you'll need to upgrade.
I think this is stupid to remove, b'cause it was easier as app Designer. In addition, it takes more time to create everything individually. And If I inserting html codes, I get always a error, b'cause it is hard to to know where I can write my codes.
If I in my "interactivity list" my button connect with my page, then do it change to "not set" back, when the app designer new reloads.