Modernize site content package and content types

[potzenheimer]

Refactor hph.sitecontent:

• [ ] Remove five:grok dependency
• [ ] Add browser views for existing contents
• [ ] Port section folder setup (Redirect implementation + panel support)

[potzenheimer]

Todo: use local pseudo static navigation tree portlet by using

assignment_context_path = self.__portlet_metadata__['key']
assignment_context = self.context.restrictedTraverse(assignment_context_path)