refactor: simplify Dockerfile by removing unnecessary build stages

Dockerfile

@@ -1,23 +1,3 @@
 # ============================
 # Prepare lint Environment
-FROM node:22-alpine AS lint-env
+FROM aiursoft/howtocookviewer:latest
-WORKDIR /app
-COPY . .
-RUN npm install --loglevel verbose
-RUN npm run build
-RUN npm run lint
-
-# ============================
-# Prepare Build Environment
-FROM python:3.13 AS python-env
-WORKDIR /app
-COPY --from=lint-env /app .
-RUN rm node_modules -rf && pip install -r requirements.txt
-RUN python3 -m properdocs build
-
-# ============================
-# Prepare Runtime Environment
-FROM nginx:1-alpine
-COPY --from=python-env /app/site /usr/share/nginx/html
-
-LABEL org.opencontainers.image.source="https://github.com/Anduin2017/HowToCook"