Try a slightly revised generateStaticSite script

generateStaticSite.sh

@@ -1,4 +1,9 @@
-cd docs
+#!/bin/bash
+
+# Set directory to location of this script
+# https://stackoverflow.com/a/3355423/1867984
+cd "$(dirname "$0")"
+
 yarn -v
 node -v
 echo 'Installing Gitbook CLI'
@@ -7,8 +12,11 @@ yarn global add gitbook-cli
 echo 'Running Gitbook installation'
 
 # Generate all version's GitBook output
+# For each directory in /docs ...
+cd ./docs/
 for D in *; do
     if [ -d "${D}" ]; then
+
 			echo "Generating output for: ${D}"
 			cd "${D}"
 
@@ -18,6 +26,7 @@ for D in *; do
 			gitbook build
 
 			cd ..
+
 		fi
 done
 
@@ -31,10 +40,12 @@ mkdir ./latest/_book/history
 for D in *; do
 	if [ -d "${D}" ]; then
 		if [ "${D}" == v* ] ; then
+
 			echo "Moving ${D} to the latest version's history folder"
 
 			mkdir "./latest/_book/history/${D}"
-			mv -v "./${D}/_book"/**/* "./latest/_book/history/${D}"
+			mv -v -r "./${D}/_book"/* "./latest/_book/history/${D}"
+
 		fi
 	fi
 done