removes git from Dockerfile and updates README

Author: ana-kop

Dockerfile

@@ -2,7 +2,7 @@ FROM python:3.7-slim-stretch
 
 RUN apt-get update && \
 apt-get upgrade -y && \
-apt-get -y install git libspatialindex-dev &&  \
+apt-get -y install libspatialindex-dev &&  \
 rm -rf /var/lib/apt/lists/*
 
 RUN /usr/local/bin/python -m pip install --no-cache-dir --compile --upgrade pip

README.md

@@ -21,6 +21,10 @@ Once assembled, these form part of our wider pipeline. But as a standalone tool,
 
 ## Install
 
+Note: you can use the instructions [here](###-Using-Docker) to build a Docker image for OSMOX and run it in a container if you cannot install it locally. 
+
+### My Multi Word Header
+
 I. Installation for Mac
 ```{sh}
 git clone [email protected]:arup-group/osmox.git