feat: review backend and frontend

- update to the latest version of Java/SpringBoot
- update to the latest version NuxtJS
- add account/password update
- add account creation
- add account password reset
- add bundle to regroup questions and add default questions on user creation
- add bundle creation

backend/.env_template

@@ -0,0 +1,14 @@
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=LKG+gD96
+DATABASE_HOST=localhost
+DATABASE_PORT=5432
+DATABASE_NAME=pluss_db
+
+MAIL_HOST=
+MAIL_PORT=
+MAIL_FROM=
+MAIL_USERNAME=
+MAIL_PASSWORD=
+MAIL_ACTIVATE_DEBUG=false
+
+FRONTEND_URL=http://localhost:3000/