restore bookdown yml

Author: trevorcampbell

_bookdown.yml

@@ -4,4 +4,4 @@ language:
   ui:
     edit: "Edit"
     chapter_name: "Chapter "
-rmd_files: ["index.Rmd", "source/intro.Rmd", "source/references.Rmd"]
+rmd_files: ["index.Rmd", "source/foreword.Rmd", "source/preface.Rmd", "source/acknowledgments.Rmd", "source/authors.Rmd", "source/intro.Rmd", "source/reading.Rmd", "source/wrangling.Rmd", "source/viz.Rmd", "source/classification1.Rmd", "source/classification2.Rmd", "source/regression1.Rmd", "source/regression2.Rmd", "source/clustering.Rmd", "source/inference.Rmd", "source/jupyter.Rmd", "source/version-control.Rmd", "source/setup.Rmd", "source/references.Rmd"]