remove legacy scripts (#113)

Author: bengry

package.json

@@ -39,9 +39,6 @@
     "publish:core:next": "npm publish ./@angular-react/core --access=public --tag next",
     "publish:fabric:next": "npm publish ./@angular-react/fabric --access=public --tag next",
     "publish:semantic-ui:next": "npm publish ./@angular-react/semantic-ui --access=public --tag next",
-    "publish:core:angular61": "npm publish ./@angular-react/core --access=public --tag angular61",
-    "publish:fabric:angular61": "npm publish ./@angular-react/fabric --access=public --tag angular61",
-    "publish:semantic-ui:angular61": "npm publish ./@angular-react/semantic-ui --access=public --tag angular61",
     "clean:docs": "rimraf docs",
     "clean:publish": "rimraf @angular-react",
     "e2e": "ng e2e",