Typescript: run with watch, SFlight sample

[chgeo]

Overhaul of the ways one can run TS projects, with cds watch now being the recommended way.

Also mention SFlight as sample code for TS instead of former hello-world of cloud-cap-samples.

[daogrady]

Thanks! I guess we should remove the logger output in cds-dk too, where we automatically detect ts projects and ask the user to use cds-ts instead?

[chgeo]

Thanks! I guess we should remove the logger output in cds-dk too, where we automatically detect ts projects and ask the user to use cds-ts instead?

Yes. See cap/cds-dk#3188

[chgeo]

@smahati can we merge this?

[smahati]

@smahati can we merge this?

I'll make a quick check and merge it.