chore: clean up build section

README.md

@@ -41,23 +41,29 @@ internet with high integrity on the supply chain of the firmware and OS used.
 
 ## Build ##
 
+### Update git submodules
+
+```
+git submodule update --init --recursive
+```
+
 ### Build a new release
 
-    ```
+```
-    make release
+make release
-    ```
+```
 
 ### Reproduce an existing release
 
-    ```
+```
-    make attest
+make attest
-    ```
+```
 
 ### Sign an existing release
 
-    ```
+```
-    make sign
+make sign
-    ```
+```
 
 ## Setup ##