cleanup(repo): remove an unused field from package.json

.gitignore

@@ -8,7 +8,6 @@ test
 .DS_Store
 tmp
 *.log
-.ng_pkg_build
 jest.debug.config.js
 .tool-versions
 /.verdaccio/build/local-registry

package.json

@@ -3,7 +3,6 @@
   "version": "11.2.6",
   "description": "Extensible Dev Tools for Monorepos",
   "homepage": "https://nx.dev",
-  "main": "index.js",
   "private": true,
   "scripts": {
     "build": "./scripts/package.sh --local",