chore(*): adopt project templates

.env.example

@@ -1,16 +1,2 @@
-COMPOSE_PROFILES=db,userbot,api
-RUN_ENVIRONMENT=prod
-
-# Leave empty for *.localhost.
-FRONTEND_DEV_HOST=
-
-DB__HOST=postgres
-DB__PORT=5432
-DB__USER=beavergram
-DB__PASSWORD=beavergram
-DB__DB_NAME=beavergram
-DB__MIN_POOL_SIZE=5
-DB__MAX_POOL_SIZE=20
-DB__SCRIPTS_CONNECTION_URL=postgresql://beavergram:beavergram@localhost:5433/beavergram
-
-STORAGE__ROOT=./storage
+COMPOSE_FILE=docker-compose.yml:backend/docker-compose.override.yml:frontend/docker-compose.override.yml
+COMPOSE_PROFILES=external,services