update deploy instructions

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.8-slim
+FROM python:3.9-slim
 ENV PYTHONUNBUFFERED 1
 WORKDIR /app
 

README.md

@@ -51,12 +51,13 @@ $ make dev
 Run `deactivate` to exit virtual environment.
 
 **Docker:**  
+To run in dev mode, create a .env file with 1 variable: `DEBUG=True`. Then run:
 ```
 docker compose build
 docker compose run web python3 manage.py migrate
 docker compose up
 ```
-To use a custom PostgreSQL database, django secret key, and API for audio generation, you can also create a .env file and specify the environment variables below before running the first command.  
+To use a custom PostgreSQL database, django secret key, and API for audio generation, you can also specify the environment variables below in the .env file.
 
 ## Environment variables
 Add following variables to the .env file:

english_exercises_app/settings.py

@@ -33,7 +33,7 @@
 SECRET_KEY = os.getenv('SECRET_KEY', '6353juantabo')
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = bool(os.getenv('DEBUG'))
+DEBUG = True
 print(DEBUG, type(DEBUG))
 
 ALLOWED_HOSTS = [