Update index.md

It is unclear where to put the Dockerfile. If you put it next to the `app` dir, the build will still succeed but the image will fail to start.
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Yaron Sheffer 2020-05-17 15:22:32 +03:00 committed by GitHub
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@ -35,7 +35,7 @@ Dockerfile is simply a text-based script of instructions that is used to
create a container image. If you've created Dockerfiles before, you might
see a few flaws in the Dockerfile below. But, don't worry! We'll go over them.
1. Create a file named Dockerfile with the following contents.
1. Create a file named Dockerfile with the following contents. Place this file under the `app` directory.
```dockerfile
FROM node:12-alpine