simplified deployment with docker (#639)

* updated Dockerfile and docker-compose.yml, replaced cron with ofelia and setup.sh with automatically executed startup.sh

* fixed permissions by setting them in setup-script

docker-compose/startup.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+chmod 775 /var/www/ -R
+chown 1000:33 /var/www -R
+
+if [ ! -f ".env" ]; then
+    cp .env.example .env
+    echo "created .env from .env.example"
+fi
+
+composer install --no-interaction --prefer-dist --optimize-autoloader
+
+php artisan storage:link || true
+php artisan key:generate
+
+php-fpm