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Part of #353. These changes also remove all command aliases from the `pulumi` command.
This includes a few changes: * The repo name -- and hence the Go modules -- changes from pulumi-fabric to pulumi. * The Node.js SDK package changes from @pulumi/pulumi-fabric to just pulumi. * The CLI is renamed from lumi to pulumi.
And also move the Node.js SDK-specific parts into the sdk/nodejs/ directory.
