Add main.js as a startup candidate for Node.js toolset

[MilanKovacic]

Feature Request

Proposal: Add main.js as a startup candidate for Node.js toolset (https://github.com/microsoft/Oryx/blob/main/doc/runtimes/nodejs.md#run)

Rationale: Several frameworks use main.js as a startup script, most notably Nest

Alternative: Nest templates by default include the following package.json script: "start:prod": "node dist/main"