Feat/nest backend

[dawidlinek]

Important

Update backend documentation to reflect NestJS transition, add history page, and make minor content adjustments.

• Documentation Updates:
  • Update Get started.mdx to reflect the transition to NestJS and remove outdated content.
  • Add History.mdx to document the history and technological evolution of the backend section.
  • Update LimeSurvey.md to hide from the sidebar.
• File Renames:
  • Rename API.md to Poradniki/API.md.
  • Rename Adonis.md to Poradniki/Adonis.md.
• Minor Changes:
  • Fix minor formatting issues in Role/index.mdx and Tools/raci.mdx.
  • Add a new board member in VIII_Board.mdx.

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[dawidlinek]

@GOLDER303