docgen: add docgen command to generate gfm docs

package.json

@@ -16,6 +16,7 @@
     "lint": "lerna run lint --since origin/master --",
     "lint:all": "lerna run lint --",
     "lint:type-deps": "node scripts/check-type-dependencies.js",
+    "docgen": "lerna run docgen",
     "docker-build": "yarn bundle && docker build . -t spotify/backstage",
     "docker-build:all": "yarn tsc && yarn build && yarn docker-build && yarn workspace example-backend build-image",
     "create-plugin": "backstage-cli create-plugin",

packages/docgen/package.json

@@ -18,7 +18,7 @@
     "build": "backstage-cli build --outputs cjs",
     "lint": "backstage-cli lint",
     "test": "backstage-cli test",
-    "test:e2e": "node e2e-test/cli-e2e-test.js",
+    "docgen": "backstage-docgen generate --output ../../docs/reference/utility-apis --format github",
     "clean": "backstage-cli clean",
     "start": "nodemon --"
   },