Prepare documentation on /doc

Dockerfile

@@ -8,13 +8,18 @@ RUN apk add --no-cache gettext nginx gcc libc-dev libffi-dev libxml2-dev libxslt
 
 RUN apk add --no-cache bash
 
-RUN mkdir /code
+RUN mkdir /code /code/docs
 WORKDIR /code
 COPY requirements.txt /code/requirements.txt
+COPY docs/requirements.txt /code/docs/requirements.txt
 RUN pip install -r requirements.txt --no-cache-dir
+RUN pip install -r docs/requirements.txt --no-cache-dir
 
 COPY . /code/
 
+# Compile documentation
+RUN sphinx-build -M html docs docs/_build
+
 RUN python manage.py collectstatic --noinput && \
         python manage.py compilemessages