Simplify

[Alienor134]

• removed mongodb credentials
• possibilty to deploy without editing .env (default values). Removed .env and added .env.example to limit push errors.
• removed the extractor (will be documented in its own submodule AltarExtractor)
• removed minio profiling to stay coherent with AltarSender (minio + mongodb are at the same level). Profiling will be useful when changing the large file storage solution but we keep it as a future feature.
• removed omniboard since it was not used. Omniboard is handled in the AltarViewer.