chore: update docker layout

Dockerfiles in root gezet zodat ze ook aan bestanden daarin kunnen

frontend/Dockerfile

@@ -1,13 +0,0 @@
-# build stage
-FROM node:22 as build-stage
-WORKDIR /app
-COPY package*.json ./
-RUN npm install
-COPY . .
-RUN npm run build
-
-# production stage
-FROM nginx:stable as production-stage
-COPY --from=build-stage /app/dist /usr/share/nginx/html
-EXPOSE 80
-CMD ["nginx", "-g", "daemon off;"]