fix(docs): fixed a poetry error

Dockerfile

@@ -1,6 +1,6 @@
 from python:3.11
 RUN pip install --upgrade pip poetry
-COPY pyproject.toml poetry.lock /
+COPY pyproject.toml poetry.lock mkdocs.yml README.md /
 
 RUN apt-get update && apt-get install -y \
     libcairo2-dev \
@@ -11,7 +11,7 @@ RUN apt-get update && apt-get install -y \
     libz-dev \
     pngquant
 RUN poetry config virtualenvs.create false
-RUN poetry install -n --with docs
+RUN poetry install -n --with docs --no-root
 
 COPY .docs /.docs
 COPY mkdocs.yml /