[FEAT] Create architecture overview of a project (in figma)

[fenton512]

Feature description

To better understanding what we are doing, the architecture should be added in figma. More detailed description for each tusk will be provided in subproblems

What is needed to be done

• database design are approved and added in figma
• endpoints with description, parameters, type (GET, PATCH, ...) are approved and added in figma
• overall design of services with their interaction are approved and added in figma
• card and packs structure are defined (how we contain it in QuizHub and locally, what happens with original pack on QuizHub if we change it locally, in which type we get cards from AI)
• define git workflow(branches, commit style) in documentation or figma

Acceptance Criteria

• all subproblems are done
• all team members can understand and describe our architecture using figma prototype