devtools/ci: fix reference in ci.sh and nodejs.sh filename

Change-Id: I370a918cc379907815c42236aa088ba8f20bd487
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/325130
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

devtools/ci/ci.sh

@@ -33,7 +33,7 @@ done
 
 # Find the repo root.
 script_dir=$(dirname "$(readlink -f "$0")")
-pkgsite_dir=$(readlink -f "${script_dir}/..")
+pkgsite_dir=$(readlink -f "${script_dir}/../..")
 
 # Run postgres.
 pg_container=$(${maybe_sudo}docker run --rm -d -e LANG=C postgres:11.4)