Update roadmap re. knative plans 🤩
Update roadmap re. knative plans 🤩

After https://github.com/knative/build/pull/569 the interests of
knative/build and knative/serving have diverged from Tekton Pipelines,
so instead of referring to plans for those projects in our roadmap, we
want to focus on getting the project to a stable state and leaving it up
to those projects to decide how they go forward with Tekton Pipelines.

tektoncd/pipeline,tektoncd/pipeline