Rename this repo

[nicojs]

to.... "Mutation testing"?

[rouke-broersma]

Perhaps the repo should be split.. It currently holds both the json schema and the web components that use the schema, and metrics packages to help calculate metrics based on the report.

Imo at least the schema should be it's own repo to improve discoverability and to make the schema less tightly coupled with the stryker implementations.