TODO workflow: delete the finished Next Step (closes #23)

The Workflow bullet that moved the finished Next Step into Completed
Steps, a heading this file no longer has, now deletes it, so finished
work does not collect here again. Status no longer says that this file
mirrors the issue tracker, which it does not.

Model: opus-5-5

docs/TODO.md

@@ -2,7 +2,7 @@
 
 - branch (from `main`)
 - do the work in Next Step
-- move Next Step to the top of Completed Steps
+- delete Next Step from `docs/TODO.md`
 - move the top item of Future Steps into Next Step
 - commit (`docs/TODO.md` changes in the same commit as the work)
 - merge to `main` if the branch is not protected, otherwise open a PR
@@ -10,8 +10,7 @@
 
 # Status
 
-pre-1.0. The Gitea issue tracker is the authoritative list of work; this
-file mirrors it.
+pre-1.0. The Gitea issue tracker is the authoritative list of work.
 
 # Next Step