Update docs for defaults

Author: yanyanzhu-pnnl

docs_site/api/utilities/defaults.md docs_site/api/defaults.mddocs_site/api/utilities/defaults.md renamed to docs_site/api/defaults.md

@@ -62,7 +62,4 @@ nav:
       - Project Operations:
           - Building Area Operations: api/operations/building-area.md
           - Envelope Operations: api/operations/envelope.md
-      - Constants:
-          - Project Template: api/constants/common.md
-          - Building Area Defaults: api/constants/building-area.md
-          - Envelope Defaults: api/constants/envelope.md
+      - Defaults: api/defaults.md