Change package.json production build script for Oryx

Change package.json "build:production" to be "build:azure" and remove func dependency

This will help wherever Oryx is being run: https://github.com/microsoft/Oryx/blob/master/doc/runtimes/nodejs.md#build

Start by inspecting package.json, focusing on the build:production script and the func dependency. Verify the requested script name and dependency removal, then confirm the resulting package configuration supports the Oryx build described in the linked documentation.

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