Installation.md

-**Installation**
-
-***Installing sen2chain***
+## Installing sen2chain
 
 This package requires pip3, Python 3, GDAL, OTB and [Sen2Cor](<http://step.esa.int/main/third-party-plugins-2/sen2cor/).
 
 Note:: The current version of sen2chain is not available on Windows.
 
-Prerequisites
+### Prerequisites
 
 pip3, GDAL and OTB
 
 ```
-code-block:: console
-
     sudo apt install gdal-bin libgdal-dev python3-gdal otb-bin python3-otb python3-pip
 ```
     
-As indicated in the `OTB installation <https://www.orfeo-toolbox.org/CookBook/Installation.html#linux-x86-64>`_, do not forget to initialize the environment when you launch a new terminal with
-
-.. code-block:: console
+As indicated in the [OTB installation](https://www.orfeo-toolbox.org/CookBook/Installation.html#linux-x86-64), do not forget to initialize the environment when you launch a new terminal with
 
+```
     source otbenv.profile
-
-
-
+```
 Sen2Cor
 
-.. code-block:: console
-
+```
     wget http://step.esa.int/thirdparties/sen2cor/2.5.5/Sen2Cor-02.05.05-Linux64.run
     chmod +x Sen2Cor-02.05.05-Linux64.run && ./Sen2Cor-02.05.05-Linux64.run
+```
 
-Install sen2chain from sources
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+### Install sen2chain from sources
 
-.. code-block:: console
 
+```
     git clone https://framagit.org/jebins/sen2chain.git
     cd sen2chain
     pip3 install --user -e .
-
+```
 
 Configuration
 -------------