move layout to project readme instead of wiki itself

README.md

@@ -5,3 +5,10 @@
 ## Continuous Integration / Continuous Deployment
 
 Actions Runner executes workflow to publish to https://sig-kernel.rocky.page on push to main.
+
+## Project layout
+
+    mkdocs.yml    # The configuration file.
+    docs/
+        index.md  # The documentation homepage.
+        ...       # Other markdown pages, images and other files.