Review feedback from #4535 (#4546)

Cargo.toml

@@ -102,8 +102,6 @@ members = [
 # Note: Workspaces in subdirectories, such as docs/tutorials/crates, are
 # implicitly excluded from the main workspace.
 exclude = [
-    # GNaw needs to be run from outside the workspace for features to work
-    "docs/tutorials/gn",
     # Testdata will still be published in the 1.x stream, but is deprecated
     # and we don't use it anymore. As we don't want to keep the actual data
     # in the repo it doesn't build without running `cargo make testdata-legacy`

Makefile.toml

@@ -3,13 +3,13 @@
 # (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
 
 extend = [
+    { path = "./docs/tutorials/gn/gn.toml"}, #
     { path = "./tools/make/data.toml"}, #
     { path = "./tools/make/valgrind.toml"}, #
     { path = "./tools/make/tidy.toml"}, #
     { path = "./tools/make/wasm.toml"}, #
     { path = "./tools/make/tests.toml"}, #
     { path = "./tools/make/ffi.toml"}, #
-    { path = "./tools/make/gn.toml"}, #
 ]
 
 [config]