Resolve "Update installation instructions"

Closes #50 (closed)

• Cherry-pick 344701b5
• delete branch 50-update-installation-instructions
• in CONTRIBUTING.md add info on how to update PROD repo (currently at gitlab.ethz.ch)

Install.md

-# Setting up the Conda environment
-
-## Install conda
-
-https://conda.io/docs/user-guide/install/
-
-## Install the environment
-
-### On Linux:
-* Open a terminal and navigate to the workshop git repository
-* Run the following command:
-
-~~~~bash
-conda env create -f environment_linux.yml
-~~~~
-
-### On Mac:
-* Open a terminal and navigate to the workshop git repository
-* Run the following command:
-
-~~~~bash
-conda env create -f environment_mac.yml
-~~~~
-
-### On Windows
-
-* Open the Anaconda Prompt and navigate to the workshop git repository
-* Run the following command:
-
-~~~~
-conda env create -f environment.yml
-~~~~