* Add new placeholder topic file - WiP
* Add content for new topic + cross-refs to it
* Change topic title just to get through the PR check for matching filename & title
* Rework the workflow example section
* Remove 4 lines from workflow - see:
https://github.com/github/code-scanning/issues/1826
* Restructure files and change topic titles and file names
* Update links to files whose names have changed
* Finish restructuring work for runner topics
* Makes changes suggested by James