Add scripts for updating and backing up data

scripts/backup.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+export $(grep -v '^#' .env | xargs -d '\n')
+mkdir -p backups
+zip -r -9 backups/plugins.zip plugins -DF --out backups/plugins-update.zip
+pg_dump -U modmapper -Fc modmapper > backups/modmapper-$(date +'%Y-%m-%d').dump
+find backups/modmapper-*.dump -mtime +30 --type f --delete
+rclone sync backups/* dropbox:modmapper