First part of backend rework

- Added the base data structure for the new database
- Added the new routes for the new database
- Reworked the users endpoints

.env.sample

@@ -1,9 +1,10 @@
+PORT=3000
+DOMAIN="http://localhost:3000"
 DATABASE_HOST="127.0.0.1"
 DATABASE_NAME=hsp-gdh
 DATABASE_USER=hsp-gdh
 DATABASE_PASSWORD=""
 JWT_SECRET=""
-PORT=
 SMTP=
 MAIL=
 MAIL_PASS=