* [Build] introduce step_measure_rtlsim_performance

* [Docs] document the rtlsim performance step

* [Docs] add comments on CPU/RAM/storage recommandations

* [Build, Test] enable rtlsim perf as part of build test too

* [Build] print where intermediate outputs are generated

* [Docs] remove ghpages content, add note

* [Docker] use -c continue for build_custom mode

* [Docs] minor fixes