Rewrite outdated chapter 18

[Doublonmousse]

Chapter 18 on profiling is quite outdated

• Traceur is not maintained and has been replaced by JET
• the Juno editor is not developped anymore so Juno.profiler won't work

Describe the solution you'd like
Rewrite the chapter to use JET and VSCode

[ChrisRackauckas]

Indeed it needs and update and that's the right direction for the updates.