Static properties-based templates aren't documented

[peitschie]

In https://aurelia.io/blog/2018/06/24/aurelia-release-notes-june-2018/#new-templating-features, new support was added to define templates using a class with $view, $resource, bindable and other properties directly set.

Would be good to have a section added to the templating docs (https://aurelia.io/docs/templating) for this, so it's more discoverable.