Update template issues and remove README (see tooling)

Author: hdamker

templates/README.md

@@ -2,10 +2,9 @@
 
 - [ ] Review repository settings, see [documentation of workflow](https://github.com/camaraproject/Template_API_Repository/tree/main/templates).
 - [ ] Check that the CODEOWNERS file is valid (potential need to wait until initial codeowners have accepted the invitation)
-- [ ] Remove /.github/workflows/setup-new-repo.yml in the new repository (as long as it is copied into it)
 - [ ] Update the README
   - choose the right badge (default: Sandbox)
   - choose the right variant for Independent Sandboxes,Sandboxes in Sub Project, Incubating, or repository for working group
   - check the wiki links for correctness
 - [ ] Assign the initial issue for CODEWONERS to the appropriate codeowners
-- [ ] Update the Onboarding Tracker within APIBacklog
+- [ ] Update the Onboarding Tracker issue within APIBacklog repository

templates/issues/initial-admin.md

@@ -1,6 +1,6 @@
 ## Initial Tasks for Codeowners
 
-- [ ] Confirm CODEOWNERS file is correct
+- [ ] Confirm that the CODEOWNERS file is correct
 - [ ] Update the scope section within README
 - [ ] Create first issues to work on (e.g. an initial API draft)