Swap to using literal code blocks

Author: christopher-wild

docs/source/installation.rst

@@ -21,35 +21,28 @@ Alternatively, on Linux systems, this can be done with `sudo apt install graphvi
 Install from source
 -------------------
 
-In future it will be possible to install from PyPI, but for now...
-
-.. code-block:: console
+In future it will be possible to install from PyPI, but for now::
 
     git clone https://github.com/CITCOM-project/CausalTestingFramework
     cd CausalTestingFramework
 
-then, to install a specific release:
+then, to install a specific release::
 
-.. code-block:: console    
     git fetch --all --tags --prune
     git checkout tags/<tag> -b <branch>
     pip install -e .
 
-e.g. version `1.0.0`
+e.g. version `1.0.0`::
 
-.. code-block:: console    
     git fetch --all --tags --prune
     git checkout tags/1.0.0 -b version
     pip install -e .
 
-or to install the latest development version:
+or to install the latest development version::
 
-.. code-block:: console    
     pip install -e .
 
-Use 
-
-.. code-block:: console
+Use::
 
     pip install -e .[dev]