Install docgen package

package.json

@@ -61,6 +61,7 @@
 		"@wordpress/babel-preset-default": "file:packages/babel-preset-default",
 		"@wordpress/browserslist-config": "file:packages/browserslist-config",
 		"@wordpress/custom-templated-path-webpack-plugin": "file:packages/custom-templated-path-webpack-plugin",
+		"@wordpress/docgen": "file:packages/docgen",
 		"@wordpress/e2e-test-utils": "file:packages/e2e-test-utils",
 		"@wordpress/e2e-tests": "file:packages/e2e-tests",
 		"@wordpress/eslint-plugin": "file:packages/eslint-plugin",
@@ -159,7 +160,7 @@
 		"dev": "npm run build:packages && concurrently \"cross-env webpack --watch\" \"npm run dev:packages\"",
 		"dev:packages": "node ./bin/packages/watch.js",
 		"docs:build": "node docs/tool",
-		"docs:api": "node packages/docgen/src/cli.js",
+		"docs:api": "docgen",
 		"fixtures:clean": "rimraf \"test/integration/full-content/fixtures/*.+(json|serialized.html)\"",
 		"fixtures:server-registered": "docker-compose run -w /var/www/html/wp-content/plugins/gutenberg --rm wordpress ./bin/get-server-blocks.php > test/integration/full-content/server-registered.json",
 		"fixtures:generate": "npm run fixtures:server-registered && cross-env GENERATE_MISSING_FIXTURES=y npm run test-unit",

packages/docgen/package.json

@@ -16,7 +16,9 @@
 	"bugs": {
 		"url": "https://github.com/WordPress/gutenberg/issues"
 	},
-	"main": "src/index.js",
+	"bin": {
+		"docgen": "./src/cli.js"
+	},
 	"devDependencies": {
 		"faucet": "0.0.1",
 		"tape": "4.9.2"