Workflow: Remove the pages folder from URL

[delisma]

Is your feature request related to a problem? Please describe.
Pages and research summaries' url have a segment /pages/ that is superfluous.

Describe the solution you'd like
Add an underscore to the pages folder in order to be ignored during the url build stage.

Additional context
To follow the URL model described in the Canada.ca Content and Information Architecture Specification we should avoid superfluous words such as “to”, “the”, “a”, “an”, “by”, “for” (for example, “/apply-student-loan” instead of “/how-to-apply-for-a-canadian-student-loan”.