feat(client): add support for static website deployment

[overbit]

Fixes : https://github.com/amplication/amplication-infrastructure-next/issues/50

PR Details

Replace the injectEnvVariables.js with nx build configurations to build the client application with the correct variables per environment.
The injectEnvVariables related scripts, nx target docker:build and Dockerfile will be deleted as soon as we complete the migration to the new static website setup.

PR Checklist

• Tests for the changes have been added
• npm test doesn't throw any error

IMPORTANT: Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[nx-cloud]

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✅ Successfully ran 4 targets

• nx affected --target=test --parallel=3 --coverage --coverageReporters=text-summary
• nx affected --target=postbuild --parallel=3
• nx affected --target=build --parallel=3
• nx affected --target=lint --parallel=3

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[levivannoort]

I'm in the midst of adding the ci/cd part for this to this pull request. If it can be detached separately, let me know @overbit

[overbit]

Sure thing

[levivannoort]

As talked about before I would still be up for keeping the Dockfiler for the client even though it isn't used in production when moving of to the cdn.

[levivannoort]

Added the ci/cd part as a pr to this branch, so should auto update to be merged to next when this is merged.