Update files to insert backend and boards db to project

.env

backend/src/index.php

boards-database/Dockerfile

boards-database/maps.sql

docker-compose.yml

frontend/src/app/map/maps-database/maps-database.service.ts

frontend/src/config/urls.ts

frontend/src/environments/environment.dev.ts

frontend/src/environments/environment.prod.ts

frontend/src/environments/environment.ts