Revisit Getting Started cli sentence

[dhmlau]

Originated from #29
Comment from @virkt25 to simplify the sentence below:

Install LoopBack 4 CLI
The LoopBack 4 CLI is a command-line interface that can scaffold a project or extension. The CLI provides the fastest way to get started with a LoopBack 4 project that adheres to best practices.

[dhmlau]

Given the huge backlog, it's probably not our priority to look into this in a near future. Closing it.