Update documentation with new Fed-BioMed CLI usage

[srcansiz]

Replace fedbiomed_run with fedbiomed

• Component/config specification has changed to --path from --config. This requires to update documentation to have correct CLI usage.
• Fed-BioMed now stores component files in a specific directory rather than ROOT Fed-BioMed directory
  - [ ] Fed-BioMed root to Fed-BioMed library source
  - [ ] or Fed-BioMed root to Fed-BioMed component root/ node installation directory
  - [ ] There is no environment cleaning script anymore. Removing component folder will clean the environment.
• fedbiomed CLI creates folders for per component created instead of creating config files and using Fed-BioMed source directory as root directory. This requires to update documentation:
  • Replace creating a new node config with create a new node or create a new component
  • Explain component creation logic that --path can be absolute or relative path to the component folder.

The points above have been completed for getting started and partially for user guide. Same changes has to be done in tutorials

• (SC) User guide
• (YB) Tutorials pytorch
• (YB) Tutorials advanced
• Tutorials security
• Tutorials scikit-learn
• Tutorials others (YB-Flamby)

[ybouilla]

Completed documentation. Only concrete-ml tutorial is left untouched because of versioning issue (see related github issue).