ISTWCMS-3452: adding script to build gesso

build_gesso.sh

+uw_wcms_gesso_root_path=${1:-/var/www/html}
+git clone "https://github.com/forumone/gesso" "$uw_wcms_gesso_root_path/uw_wcms_gesso/gesso"
+cd "$uw_wcms_gesso_root_path/uw_wcms_gesso/gesso"
+rm -rf "$uw_wcms_gesso_root_path/uw_wcms_gesso/gesso/source"
+ln -s "$uw_wcms_gesso_root_path/uw_wcms_gesso/source"
+# Adding symbolic link to source, as gesso_helper module hard-codes the twig_functions to add
+# to "Themepath/SORUCE/..."
+
+echo "Removing Gesso files"
+rm gesso.layouts.yml
+rm gesso.info.yml
+rm gesso.libraries.yml
+rm gesso.breakpoints.yml
+rm Dockerfile
+rm screenshot.png
+rm -rf templates
+echo "Done removing gess theme files."
+
+echo "Running npm install..."
+npm install
+echo "Done."
+
+echo "Running gulp build..."
+gulp build