Make first time install easier and remove reliance on local npm

.dockerignore

@@ -1,5 +1,6 @@
 .dockerignore
 .git
+.gitkeep
 docker-compose.yml
 Dockerfile
 README.md

.gitignore

@@ -4,8 +4,9 @@ __pycache__
 db.sqlite3
 /static
 /node_modules
-/app/static/assets
+/app/static/assets/*
 /app/static/*.css
 /app/static/*.css.map
 /app/static/*.min.js
-/app/static/*.min.js.map
+/app/static/*.min.js.map
+!.gitkeep

README.md

@@ -5,21 +5,24 @@
 ```sh
 # Build and start the container
 docker compose up -d
+```
+
+### Add the static assets
 
-# Install Node modules
-npm install
+During the first time install, your `app/static/assets` directory will be empty.
 
-# Create a static assets directory
-mkdir app/static/assets
+As you mount the project directory to the `/app` volume, the static assets from TNA Frontend installed inside the container will be "overwritten" by your empty directory.
 
-# Copy in the TNA Frontend static assets
-cp -r node_modules/@nationalarchives/frontend/nationalarchives/assets/* app/static/assets
+To add back in the static assets, run:
+
+```sh
+docker compose exec app cp -r /app/node_modules/@nationalarchives/frontend/nationalarchives/assets /app/app/static
 ```
 
 ### Run tests
 
 ```sh
-docker compose exec dev poetry run python manage.py test
+docker compose exec dev poetry run python /app/manage.py test
 ```
 
 ### Format and lint code

docker-compose.yml

@@ -26,6 +26,7 @@ services:
       - db
     volumes:
       - ./:/app
+
   db:
     image: postgres:latest
     environment: