add/remove alternatives

client/src/interfaces/ApiModels.ts

client/src/interfaces/ApiRichModels.ts

client/src/pages/admin/competitions/CompetitionManager.tsx

client/src/pages/login/components/AdminLogin.tsx

...t/src/pages/presentationEditor/PresentationEditorPage.tsx

...ges/presentationEditor/components/CompetitionSettings.tsx

...src/pages/presentationEditor/components/SlideSettings.tsx

server/app/apis/__init__.py

server/app/apis/alternatives.py

server/app/apis/answers.py

server/app/apis/competitions.py

server/app/apis/questions.py

server/app/apis/slides.py

server/app/core/dto.py

server/app/core/parsers.py

server/app/core/rich_schemas.py

server/app/core/schemas.py

server/app/database/controller/__init__.py

server/app/database/controller/add.py

server/app/database/controller/copy.py