📝 Clarify environment configuration

Author: tiangolo

.env

@@ -1,4 +1,4 @@
-# Environment: local, staging, production
+# Enable local-only development behavior
 ENVIRONMENT=local
 
 PROJECT_NAME="Full Stack FastAPI Project"

deployment.md

@@ -54,24 +54,22 @@ export DOMAIN=fastapi-project.example.com
 
 The deployment Docker Compose configuration also uses `DOMAIN` to set the public frontend URL used in links generated by the backend.
 
-Set the `POSTGRES_PASSWORD` to something different than `changethis`:
+Set the `POSTGRES_PASSWORD` to a secure value:
 
 ```bash
-export POSTGRES_PASSWORD="changethis"
+export POSTGRES_PASSWORD="$(python -c 'import secrets; print(secrets.token_urlsafe(32))')"
 ```
 
-Set the `SECRET_KEY`, used to sign tokens:
+Set the `SECRET_KEY`, used to sign tokens, to a secure value:
 
 ```bash
-export SECRET_KEY="changethis"
+export SECRET_KEY="$(python -c 'import secrets; print(secrets.token_urlsafe(32))')"
 ```
 
-Note: you can use the Python command above to generate a secure secret key.
-
-Set the `FIRST_SUPERUSER_PASSWORD` to something different than `changethis`:
+Set the `FIRST_SUPERUSER_PASSWORD` to a secure value:
 
 ```bash
-export FIRST_SUPERUSER_PASSWORD="changethis"
+export FIRST_SUPERUSER_PASSWORD="$(python -c 'import secrets; print(secrets.token_urlsafe(32))')"
 ```
 
 You can set several other environment variables: