docs(docs): Generalize sub-section page creation WIP

Author: stevenj

specs/generators/pages/signed_doc/voting_process/.pages.jinja

@@ -0,0 +1,5 @@
+title: Voting Process
+nav:
+{% for doc in extra.pages_data %}
+  - {{ doc.front_matter.Title }}: {{ doc.path.stem }}
+{% endfor %}