Build static assets in Azure

[howlowck]

Currently the client code is generated in the development machine. This means that every time we want to push to the server, we have to run yarn run deploy:prod on the local machine. The generated file names has a hash between the filename and file extension (ie app.28f32jdi123fnbvbh.js) for cache busting.

Since the generated files are in the git repository, it makes collaboration difficult. Every time someone pushes with a newly generated files. Another developer will get merge conflicts when he/she tries to push.

The ideal is Azure needs to generate the static assets during the build process. This will make development with multiple developers much easier, eliminating merge conflicts.