docs(roadmap): rewrite for new release process

Author: mboersma

mkdocs.yml

@@ -62,8 +62,7 @@ pages:
   - Roadmap:
     - Planning Process: roadmap/planning-process.md
     - Roadmap: roadmap/roadmap.md
-    - Release Schedule: roadmap/release-schedule.md
-    - Release Checklist: roadmap/release-checklist.md
+    - Releases: roadmap/releases.md
   - Contributing:
     - Overview: contributing/overview.md
     - Design Documents: contributing/design-documents.md

src/roadmap/planning-process.md

@@ -34,4 +34,4 @@ Thanks to [Amy Lindburg][] and our friends at [Docker][] for their inspiration.
 [Docker]: https://www.docker.com/
 [event]: https://goo.gl/q27Jyh
 [Maintainers]: ../contributing/maintainers.md
-[Release Schedule]: release-schedule.md
+[Release Schedule]: releases.md