Merge "Add text to infra docs index"

docs-site/infra-documents.yaml

@@ -1,6 +1,4 @@
 documents:
-  - name: Infrastructure Manual
-    directory: manual
   - name: Elastic Recheck
     directory: elastic-recheck
   - name: Grafana Dashboard Builder
@@ -13,11 +11,7 @@ documents:
     directory: openstackid
   - name: Shade
     directory: shade
-  - name: Slide Presentations
-    directory: publications
   - name: Storyboard
     directory: storyboard
-  - name: System Configuration
-    directory: system-config
   - name: Zuul
     directory: zuul