Make old manuscript files *actually* delete

[cansavvy]

Purpose/implementation Section

What changes are being implemented in this Pull Request?

Despite the rm -rf manuscript command, old files in the manuscript folder still remain (see the two 2- files in this example: https://github.com/griffithlab/CIVIC_SVI_Course/tree/main/manuscript).

What was your approach?

I think in this instance we actually needed a force push to make sure old files in the manuscript folder are not kept.

To test this, I'm adding a dummy file: manuscript/2-old-version-chapter.md. This dummy file should be deleted if the changes to render-all.yml are correct.

[github-actions]

No broken urls! 🎉
Comment updated at 2023-05-24 with changes from 706a2ba

[github-actions]

Re-rendered previews from the latest commit:

• See preview of Bookdown here
• See preview of Coursera/Leanpub version here
• Download the preview of .docx file

Updated at 2023-05-24 with changes from 706a2ba

[github-actions]

No spelling errors! 🎉
Comment updated at 2023-05-24 with changes from 706a2ba

[cansavvy]

I may have to test this by actually merging it. It can't find the main branch when I run the workflow from this branch.

[cansavvy]

I'm going to do a YOLO thing so I can test if this will actually work. I'm going to be bad and merge this. I think the error: src refspec main does not match any error: failed to push some refs to 'https://***@github.com/jhudsl/OTTR_Template' error is because its not being run on main when I test it.