Rm outdated doc for devs

Author: amorison

docs/sources/developers.rst

@@ -74,47 +74,3 @@ Then, in the ``docs`` directory, run::
 
 Open the produced file ``_build/html/index.html`` in your navigator to browse
 your local version of the documentation.
-
-Installation in a virtual environment
--------------------------------------
-
-A ``Makefile`` in the git repository allows you to install the development
-version of StagPy in a virtual environment with all the necessary dependencies.
-Simply run ``make`` to do so.
-
-The version installed in the virtual environment points directly towards the
-source files. It means that you don't need to run ``make`` again for your
-changes to the source files to be taken into account.
-
-To activate the virtual environment, source the relevant script::
-
-    % source stagpy_git/bin/activate
-
-Once this is done, launching the ``stagpy`` command and importing StagPy in a
-Python script (``import stagpy``) will use the development version of StagPy.
-To check that everything works fine, go to any subdirectory of the ``Examples``
-directory of the repository and run::
-
-    % stagpy field
-
-This should create a PDF file showing a plot of the temperature field with
-streamlines.
-
-Launch the ``deactivate`` command to get out of the virtual environment.
-
-Use as a Jupyter notebook kernel
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-If you want to access the virtual environment - and therefore the development
-version of StagPy - in a Jupyter notebook, run
-::
-
-    % make notebook-kernel
-
-This will create a new Jupyter kernel named ``stagpy-git`` you can use to
-access the virtual environment in a notebook.
-
-To remove that kernel, run
-::
-
-    % jupyter kernelspec uninstall stagpy-git