Small fixes to developer documentation (#258)

* Mention option to develop on windows.

* How to run Documentation locally

* Revert "How to run Documentation locally"

This reverts commit 75892ae.

* The docs are build automatically.

docs/source/dev_guide.rst

@@ -54,15 +54,26 @@ the procedure. If not, here is how you do this:
 * `Youtube - How To Pull Request in 3 Minutes <https://www.youtube.com/watch?v=jRLGobWwA3Y>`_
 
 Documentation
-.............
+-------------
 
 The `PiFinder documentation <https://pifinder.readthedocs.io/en/release/index.html>`_
 is written in `reStructuredText <https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#external-links>`_ . 
-The files are located in PiFinders GitHub repository under ``docs`` and have 
-the ending ``.rst``. Many open source projects use `redthedocs.io <eadthedocs.io>` 
-for creating documentation since it is immediately generated, when you are committing 
-the GitHub code (CI/CD pipeline). It is very easy to link your fork of the documentation 
-code to GitHub. 
+The files are located in PiFinders GitHub repository under ``docs/source`` and have 
+the ending ``.rst``. The documentation is then published to `redthedocs.io <eadthedocs.io>`_, when the change is committed 
+to the official GitHub repository (using readthedocs's infrastructure). 
+
+You can link your fork also to your account on readthedocs.io, but it is easier to build the documentation locally. 
+For this install sphinx using pip: 
+
+.. code-block::
+
+    pip install -r sphinx sphinx_rtd_theme
+
+You can then use the supplied ``Makefile`` to build a html tree using ``make html`` and running a http server in the directory with the files: 
+
+.. code-block::
+
+    cd build/html; python -m http.server
 
 
 Setup the development environment
@@ -89,6 +100,10 @@ You can also develop on any Posix compatible system (Linux / MacOS) in roughly t
 same way you can on a Raspberry Pi.  The emulated hardware and networking features 
 will work differently so this is mostly useful for UI/Catalog feature development.
 
+Note that you can develop on Windows by activating Windows Subsystem for Linux (WSL2) 
+and installing Ubuntu from the Microsoft Store. The window launched by PiFinder will 
+be fully integrated into your windows desktop. 
+
 To get started, fork the repo and set up your virtual environment system of choice
 using Python 3.9.  Then follow some of the steps below!