Replace dummy conceptual docs with article on elicitation

Author: mikekistler

docs/concepts/architecture.md

@@ -1,9 +1,5 @@
 items:
 - name: Overview
   href: index.md
-- name: Introduction
-  uid: introduction
-- name: Architecture
-  uid: architecture
-- name: Key Concepts
-  uid: key-concepts
+- name: Elicitation
+  uid: elicitation