Show some message while app is building

[fvictorio]

Closes #5. Depends on 0xProject/0x-launch-kit-frontend#499 being merged and the new image being published.

This copies a template showing a message before starting to build the app. After the build finishes, the message is overwritten by the built app.

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Some extra details in case anyone cares:

First, I had to serve the assets from production-build instead of build, because create-react-app cleans the whole build directory when it starts, and so the message was being deleted.

I also added a depends_on: nginx to the frontend container. Nginx adds its own index.html when it starts, and it can overwrite the copied template. With this dependency, we guarantee that the shown index.html is the one we copied.

[1Blackdiamondsc]

Show some message while app is building

[GAEAlimited]

Hey @fvictorio, while reviewing your PR, I'd suggest the following code changes:

👉 Code Suggestion for #6

#6

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