["Problem"] previewing new chapters

[KatherineCox]

Describe what is not working with the template or is unclear in the documentation

I haven't tested thoroughly, but I've noticed a couple times that the auto-generated preview has trouble with newly created chapters.

If I merge the PR, the new chapter renders fine and the links work in the "published" bookdown; it's just in the preview that it's broken.

Please link to the specific course repository you are working on

jhudsl/AnVIL_Book_Getting_Started#127

Here's an open PR demonstrating the problem. I've added a new chapter at the end of the book (as Appendix H). The link shows up in the toc, but it's broken (404 error).

I saw the same problem on this PR (adding "Appendix B: Troubleshooting"), but now that I've merged it the chapter shows up as expected in the published book (and the preview is gone, so, you can't see the problem there).

To Reproduce

1. Clone/pull repo and make branch
2. Add a new chapter (.Rmd file), also add it to _bookdown.yml. This renders fine locally.
3. Push changes (.Rmd file, _bookdown.yml) and make a PR
4. View the autogenerated GitHub preview (Bookdown) and try to view the new chapter. The new chapter shows up in the table of contents, but I get a 404 error if I try to click on it.

This repo has been synced with the OTTR_Template repo as of the most recent release, so the github actions should be up-to-date minus any changes made since then.

[cansavvy]

I'll take a look into this, @KatherineCox Thanks!