only ignore w/ autobuild

docs/bin/build

@@ -15,13 +15,18 @@ fi
 rm -rf _build/html
 
 sphinx_command="sphinx-autobuild"
+
+# must ignore generated dir with sphinx-autobuild or it becomes recursive
+additional_args="--ignore '**/_tags/*'"
+
 if [[ "$run_ci" == "true" ]]; then
   sphinx_command="sphinx-build"
+  additional_args=""
 fi
 
 #>> sphinx-build --help 2>&1 | grep -E '^ +\-[aWn]\>'
 #   -a                write all files (default: only write new and changed
 #   -j N              build in parallel with N processes where possible
 #   -n                nit-picky mode, warn about all missing references
 #   -W                turn warnings into errors
-"$sphinx_command" . _build/html -W -a -n -j auto --ignore '**/_tags/*'
+"$sphinx_command" . _build/html -W -a -n -j auto $additional_args