Package name fix for seed projects

The seed projects referenced by the `cleverstack-cli` has names as `cleverstack-angular-seed`, whereas the repos themselves are named as `angular-seed` in their respective `package.json` files. This prevents any operation that requires the package names, such as `clever serve`.

I followed the documentation as it was and got stuck at `clever serve`, till I fixed this.

Also, it's worthwhile looking at how we can abstract out these constants without hardcoding them everywhere.