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chore: removed unused npm package from root (#742)

## Summary
Javascript SDK is a monorepo which contains the javascript SDK and supporting packages in `packages` subfolder. We initially had a parent npm package at root to manage subpackages together but its no longer being used. This PR removed that unused npm package and updates readme.

## Test plan
All existing tests should pass

1100 of 1236 branches covered (89.0%)

Branch coverage included in aggregate %.

9634 of 9809 relevant lines covered (98.22%)

521.93 hits per line