docs: turn e2e/core into toolchain example

diff --git a/.bazelrc b/.bazelrc
index d992d92..22e5a14 100644
--- a/.bazelrc
+++ b/.bazelrc

@@ -5,8 +5,8 @@
 # This lets us glob() up all the files inside the examples to make them inputs to tests
 # To update these lines, just run `yarn bazel:update-deleted-packages`
 # (Note, we cannot use common --deleted_packages because the bazel version command doesn't support it)
-build --deleted_packages=e2e/bazel_managed_deps,e2e/concatjs_devserver,e2e/concatjs_devserver/genrule,e2e/concatjs_devserver/subpackage,e2e/concatjs_devserver_directory_artifacts,e2e/concatjs_devserver_directory_artifacts/genrule,e2e/concatjs_devserver_directory_artifacts/subpackage,e2e/core,e2e/coverage,e2e/fine_grained_symlinks,e2e/jasmine,e2e/node_loader_no_preserve_symlinks,e2e/node_loader_preserve_symlinks,e2e/nodejs_image,e2e/nodejs_image/foolib,e2e/nodejs_repository,e2e/packages,e2e/symlinked_node_modules_npm,e2e/symlinked_node_modules_yarn,e2e/typescript,e2e/webapp,examples/angular,examples/angular/e2e,examples/angular/src,examples/angular/src/app,examples/angular/src/app/hello-world,examples/angular/src/app/home,examples/angular/src/app/todos,examples/angular/src/app/todos/reducers,examples/angular/src/assets,examples/angular/src/lib/shorten,examples/angular/src/shared/material,examples/angular/tools,examples/angular_bazel_architect,examples/angular_bazel_architect/projects/frontend-lib,examples/app,examples/app/styles,examples/app/test,examples/closure,examples/create-react-app,examples/cypress,examples/esbuild,examples/esbuild/src,examples/from_source,examples/jest,examples/jest/ts,examples/jest/ts/src,examples/jest/ts/test,examples/kotlin,examples/nestjs,examples/nestjs/src,examples/parcel,examples/protobufjs,examples/protocol_buffers,examples/react_webpack,examples/user_managed_deps,examples/vendored_node,examples/vendored_node_and_yarn,examples/vue,examples/vue/src,examples/vue/src/components/HelloWorld,examples/web_testing,examples/webapp,examples/worker
-query --deleted_packages=e2e/bazel_managed_deps,e2e/concatjs_devserver,e2e/concatjs_devserver/genrule,e2e/concatjs_devserver/subpackage,e2e/concatjs_devserver_directory_artifacts,e2e/concatjs_devserver_directory_artifacts/genrule,e2e/concatjs_devserver_directory_artifacts/subpackage,e2e/core,e2e/coverage,e2e/fine_grained_symlinks,e2e/jasmine,e2e/node_loader_no_preserve_symlinks,e2e/node_loader_preserve_symlinks,e2e/nodejs_image,e2e/nodejs_image/foolib,e2e/nodejs_repository,e2e/packages,e2e/symlinked_node_modules_npm,e2e/symlinked_node_modules_yarn,e2e/typescript,e2e/webapp,examples/angular,examples/angular/e2e,examples/angular/src,examples/angular/src/app,examples/angular/src/app/hello-world,examples/angular/src/app/home,examples/angular/src/app/todos,examples/angular/src/app/todos/reducers,examples/angular/src/assets,examples/angular/src/lib/shorten,examples/angular/src/shared/material,examples/angular/tools,examples/angular_bazel_architect,examples/angular_bazel_architect/projects/frontend-lib,examples/app,examples/app/styles,examples/app/test,examples/closure,examples/create-react-app,examples/cypress,examples/esbuild,examples/esbuild/src,examples/from_source,examples/jest,examples/jest/ts,examples/jest/ts/src,examples/jest/ts/test,examples/kotlin,examples/nestjs,examples/nestjs/src,examples/parcel,examples/protobufjs,examples/protocol_buffers,examples/react_webpack,examples/user_managed_deps,examples/vendored_node,examples/vendored_node_and_yarn,examples/vue,examples/vue/src,examples/vue/src/components/HelloWorld,examples/web_testing,examples/webapp,examples/worker
+build --deleted_packages=e2e/bazel_managed_deps,e2e/concatjs_devserver,e2e/concatjs_devserver/genrule,e2e/concatjs_devserver/subpackage,e2e/concatjs_devserver_directory_artifacts,e2e/concatjs_devserver_directory_artifacts/genrule,e2e/concatjs_devserver_directory_artifacts/subpackage,examples/toolchain,e2e/coverage,e2e/fine_grained_symlinks,e2e/jasmine,e2e/node_loader_no_preserve_symlinks,e2e/node_loader_preserve_symlinks,e2e/nodejs_image,e2e/nodejs_image/foolib,e2e/nodejs_repository,e2e/packages,e2e/symlinked_node_modules_npm,e2e/symlinked_node_modules_yarn,e2e/typescript,e2e/webapp,examples/angular,examples/angular/e2e,examples/angular/src,examples/angular/src/app,examples/angular/src/app/hello-world,examples/angular/src/app/home,examples/angular/src/app/todos,examples/angular/src/app/todos/reducers,examples/angular/src/assets,examples/angular/src/lib/shorten,examples/angular/src/shared/material,examples/angular/tools,examples/angular_bazel_architect,examples/angular_bazel_architect/projects/frontend-lib,examples/app,examples/app/styles,examples/app/test,examples/closure,examples/create-react-app,examples/cypress,examples/esbuild,examples/esbuild/src,examples/from_source,examples/jest,examples/jest/ts,examples/jest/ts/src,examples/jest/ts/test,examples/kotlin,examples/nestjs,examples/nestjs/src,examples/parcel,examples/protobufjs,examples/protocol_buffers,examples/react_webpack,examples/user_managed_deps,examples/vendored_node,examples/vendored_node_and_yarn,examples/vue,examples/vue/src,examples/vue/src/components/HelloWorld,examples/web_testing,examples/webapp,examples/worker
+query --deleted_packages=e2e/bazel_managed_deps,e2e/concatjs_devserver,e2e/concatjs_devserver/genrule,e2e/concatjs_devserver/subpackage,e2e/concatjs_devserver_directory_artifacts,e2e/concatjs_devserver_directory_artifacts/genrule,e2e/concatjs_devserver_directory_artifacts/subpackage,examples/toolchain,e2e/coverage,e2e/fine_grained_symlinks,e2e/jasmine,e2e/node_loader_no_preserve_symlinks,e2e/node_loader_preserve_symlinks,e2e/nodejs_image,e2e/nodejs_image/foolib,e2e/nodejs_repository,e2e/packages,e2e/symlinked_node_modules_npm,e2e/symlinked_node_modules_yarn,e2e/typescript,e2e/webapp,examples/angular,examples/angular/e2e,examples/angular/src,examples/angular/src/app,examples/angular/src/app/hello-world,examples/angular/src/app/home,examples/angular/src/app/todos,examples/angular/src/app/todos/reducers,examples/angular/src/assets,examples/angular/src/lib/shorten,examples/angular/src/shared/material,examples/angular/tools,examples/angular_bazel_architect,examples/angular_bazel_architect/projects/frontend-lib,examples/app,examples/app/styles,examples/app/test,examples/closure,examples/create-react-app,examples/cypress,examples/esbuild,examples/esbuild/src,examples/from_source,examples/jest,examples/jest/ts,examples/jest/ts/src,examples/jest/ts/test,examples/kotlin,examples/nestjs,examples/nestjs/src,examples/parcel,examples/protobufjs,examples/protocol_buffers,examples/react_webpack,examples/user_managed_deps,examples/vendored_node,examples/vendored_node_and_yarn,examples/vue,examples/vue/src,examples/vue/src/components/HelloWorld,examples/web_testing,examples/webapp,examples/worker
 
 # Mock versioning command to test the --stamp behavior
 build --workspace_status_command="echo BUILD_SCM_VERSION 1.2.3"

diff --git a/e2e/BUILD.bazel b/e2e/BUILD.bazel
index cb34a9f..f5571d5 100644
--- a/e2e/BUILD.bazel
+++ b/e2e/BUILD.bazel

@@ -61,11 +61,6 @@
 )
 
 e2e_integration_test(
-    name = "e2e_core",
-    repositories = {"//:release-core": "rules_nodejs"},
-)
-
-e2e_integration_test(
     name = "e2e_nodejs_image",
     bazel_commands = [
         "info",

diff --git a/examples/BUILD.bazel b/examples/BUILD.bazel
index 6b52c4a..ae451cb 100644
--- a/examples/BUILD.bazel
+++ b/examples/BUILD.bazel

@@ -72,6 +72,11 @@
 )
 
 example_integration_test(
+    name = "examples_toolchain",
+    repositories = {"//:release-core": "rules_nodejs"},
+)
+
+example_integration_test(
     name = "examples_closure",
     npm_packages = {
         "//packages/runfiles:npm_package": "@bazel/runfiles",

diff --git a/e2e/core/BUILD.bazel b/examples/toolchain/BUILD.bazel
similarity index 100%
rename from e2e/core/BUILD.bazel
rename to examples/toolchain/BUILD.bazel


diff --git a/e2e/core/WORKSPACE b/examples/toolchain/WORKSPACE
similarity index 100%
rename from e2e/core/WORKSPACE
rename to examples/toolchain/WORKSPACE


diff --git a/e2e/core/defs.bzl b/examples/toolchain/defs.bzl
similarity index 100%
rename from e2e/core/defs.bzl
rename to examples/toolchain/defs.bzl


diff --git a/nodejs/toolchain.bzl b/nodejs/toolchain.bzl
index 0651907..ce66d6f 100644
--- a/nodejs/toolchain.bzl
+++ b/nodejs/toolchain.bzl

@@ -13,6 +13,8 @@
 # limitations under the License.
 
 """This module implements the node toolchain rule.
+
+See /examples/toolchain for usage example.
 """
 
 NodeInfo = provider(