Revert "Add workflows to add, update, and cleanup docs previews"

This reverts commit a7a8440.

Author: JeffersGlass

.github/workflows/docs-preview-build.yml

@@ -71,5 +71,3 @@ Once you're happy with your changes, add them to your git branch and push them t
 ```
 
 Finally, open a Pull Request on the [SPy GitHub page](https://github.com/spylang/spy).
-
-Once the pull request is open, a preview build of the documentation site with your changes will be generated automatically. Click on the generated link that appears in a comment on your PR, and give your documentation one final review to ensure everything still looks correct after it's been built in CI.