docker: fewer dependencies

The Dockerfile needed a git dependency.
Now i use the COPY command to get the same result.

Dockerfile

@@ -0,0 +1,23 @@
+FROM ubuntu:16.04
+
+MAINTAINER Tiyn tiyn@martenkante.eu
+
+RUN apt-get update
+
+RUN apt-get upgrade -y
+
+RUN apt-get install python3 python3-pip -y
+
+COPY src /blog
+
+WORKDIR /blog
+
+RUN pip3 install -r requirements.txt
+
+VOLUME /blog/templates/entry
+
+EXPOSE 5000
+
+ENTRYPOINT [ "python3" ]
+
+CMD [ "app.py" ]