Remove broken link to roadmap (#1511)
Remove broken link to roadmap (#1511)

The docs/ROADMAP.md link doesn't work and I don't see a replacement, so either remove the link or update it.
testcontainers/testcontainers-java,outofcoffee/testcontainers-java,testcontainers/testcontainers-java,outofcoffee/testcontainers-java,rnorth/test-containers,rnorth/test-containers,outofcoffee/testcontainers-java,rnorth/test-containers,testcontainers/testcontainers-java