Create pages from _content.gotmpl

Closes #12427
Closes #12485
Closes #6310
Closes #5074

resources/resource/resourcetypes.go

@@ -74,15 +74,23 @@ type ErrProvider interface {
 
 // Resource represents a linkable resource, i.e. a content page, image etc.
 type Resource interface {
+	ResourceWithoutMeta
+	ResourceMetaProvider
+}
+
+type ResourceWithoutMeta interface {
 	ResourceTypeProvider
 	MediaTypeProvider
 	ResourceLinksProvider
-	ResourceNameTitleProvider
-	ResourceParamsProvider
 	ResourceDataProvider
 	ErrProvider
 }
 
+type ResourceWrapper interface {
+	UnwrappedResource() Resource
+	WrapResource(Resource) ResourceWrapper
+}
+
 type ResourceTypeProvider interface {
 	// ResourceType is the resource type. For most file types, this is the main
 	// part of the MIME type, e.g. "image", "application", "text" etc.