Add documentation about image builds (#1301)

Signed-off-by: Mohammed Naser mnaser@vexxhost.com
diff --git a/doc/source/index.rst b/doc/source/index.rst
index f7150fc..38b7906 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -24,6 +24,7 @@
    :caption: Contents:
 
    quick-start
+   arch/index
    config/index
    deploy/index
    admin/index