Update information on IREE C++ Template (#9815)

The custom dialect example was removed as also done upstream.
diff --git a/docs/website/docs/community/index.md b/docs/website/docs/community/index.md
index a5d7c96..f4bd8df 100644
--- a/docs/website/docs/community/index.md
+++ b/docs/website/docs/community/index.md
@@ -9,8 +9,7 @@
 
 *   The [IREE C++ Template](https://github.com/iml130/iree-template-cpp)
     demonstrates how to integrate IREE into a third-party project with CMake.
-    The project demonstrates the usage of runtime support and how to use a
-    custom dialect alongside with the runtime.
+    The project demonstrates the usage of runtime support.
 
 *   The [IREE LLVM Sandbox](https://github.com/iree-org/iree-llvm-sandbox)
     contains experimental work by the IREE team closely related to LLVM and