Fix README output

[joluj]

The README.mds were in the wrong directory in the build output. This PR fixes which also makes the NPM page proper again (https://www.npmjs.com/package/@jvalue/jayvee-interpreter-lib).

Before:

interpreter-lib/
├── libs
│   └── interpreter-lib
│       └── README.md
├── main.js
├── package.json
└── package-lock.json

With these changes:

interpreter-lib/
├── main.js
├── package.json
├── package-lock.json
└── README.md