[stable/2023.1] Add documentation about image builds (#1304)

This is an automated cherry-pick of #1301
/assign mnaser
diff --git a/doc/source/arch/index.rst b/doc/source/arch/index.rst
new file mode 100644
index 0000000..f48d570
--- /dev/null
+++ b/doc/source/arch/index.rst
@@ -0,0 +1,8 @@
+############
+Architecture
+############
+
+.. toctree::
+   :maxdepth: 2
+
+   images