Remove non-required fields from package.json
Remove non-required fields from package.json

This project is not available via npm. The package.json is used for
front-end dependency management only, i.e.:

- Download and install front-end dependencies
- Call front-end task manager `gulp` to deploy front-end dependencies
- Compile and deploy styles

in-toto/layout-web-tool,in-toto/layout-web-tool,in-toto/layout-web-tool