work on reference to chrome and exclude pages

Author: briantoby

.github/workflows/mkdocs_pdf.yml

@@ -48,7 +48,7 @@ jobs:
           cd MDhelp
           mv mkdocs.yml_pdf mkdocs.yml
           #mkdocs build
-          ENABLE_PDF_EXPORT=1 chromium-browser=`which chrome` mkdocs build
+          ENABLE_PDF_EXPORT=1 mkdocs build
           # mv site/GSASII-help.pdf ...
           #cp -vr site ../help_test