move attachments and nginx to util folder

util/Nginx/build.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -e
+
+DIR="$(dirname $(readlink -f $0))"
+
+echo -e "\n# Building nginx"
+
+echo -e "\nBuilding docker image"
+docker --version
+docker build -t bitwarden/nginx $DIR/.