update the CONTRIBUTING readme to point to build instructions (third time is a charm)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d8b0a4c..0460359 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -8,11 +8,11 @@
 
 ## If you want to build the project locally ##
 
-For Windows systems, see our detailed instructions on the [CMake README](build/cmake/README.md).
+For Windows systems, see our detailed instructions on the [CMake README](/build/cmake/README.md).
 
-For Windows Native C++ builds, see our detailed instructions on the [WinCPP README](build/wincpp/README.md).
+For Windows Native C++ builds, see our detailed instructions on the [WinCPP README](/build/wincpp/README.md).
 
-For unix systems, see our detailed instructions on the [Docker README](build/docker/README.md).
+For unix systems, see our detailed instructions on the [Docker README](/build/docker/README.md).
 
 ## If you want to review open issues... ##