fix: fix dockerfile

Dockerfile

@@ -1,19 +1,15 @@
-# To run spidy in a container and write all files back to the host filesystem:
-#   docker run --rm -it -v $PWD:/data spidy
+# Usage:
+# 1. Build this image:
+#     docker build -t spidy:latest .
+# 2. Run spidy container:
+#     docker run --rm -it -v $PWD:/data spidy
 
 FROM python:3.6
-LABEL maintainer "Peter Benjamin <[email protected]>"
 WORKDIR /src/app/
 COPY . .
-VOLUME [ "/data" ]
+RUN pip install -r requirements.txt
 
-RUN apt-get update \
-    && apt-get install -y \
-    --no-install-recommends \
-    python3 \
-    python3-lxml \
-    python3-requests \
-    && rm -rf /var/cache/apt/* \
-    && pip install -r requirements.txt
+VOLUME [ "/data" ]
+WORKDIR /data
 
-ENTRYPOINT [ "python", "spidy/crawler.py" ]
+ENTRYPOINT [ "python", "/src/app/spidy/crawler.py" ]