remove generated files from git

Author: alexphelps

.gitignore

@@ -16,6 +16,14 @@ venv
 .cache-loader
 /.source
 
+# Generated API reference docs (regenerated by npm run build)
+/content/docs/admin-api/reference/
+/content/docs/webhooks/reference/
+/content/docs/storefront/graphql/queries/
+/content/docs/storefront/graphql/mutations/
+/content/docs/campaigns/api/*/
+/lib/generated/
+
 # Misc
 .DS_Store
 .env.local