Introduce DeathReaper (#256, #443)

Moulrequested to merge
256_excluded into main
  • Remove Debian version specification from pip image
  • poetry image: Remove libsodium installation
  • Introduce DeathReaper wot exclusions command
  • Add code displaying CS+ stored username
  • Introduce pydiscourse dependency
  • images: Install extra deathreaper dependency group
  • Document DeathReaper

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