Update Getting started

[radomirchev]

Update CLI related topics prior release of CLI MCP:
https://www.infragistics.com/products/ignite-ui-angular/angular/components/general/cli-overview
https://www.infragistics.com/products/ignite-ui-angular/angular/components/general/getting-started
For Getting started, change the flow to start with igniteui CLI not Angular CLI