docs(contribute): add documentation contribution

docs/source/contribute.rst

@@ -45,14 +45,28 @@ Access Portainer at `http://localhost:9000 <http://localhost:9000>`_
 .. TIP::
    The frontend application will be updated when you save your changes to any of the sources (:file:`app/**/*.js`, :file:`assets/css/app.css` or :file:`index.html`). Just refresh the browser.
 
-.. IMPORTANT::
-   Do not forget to `lint <http://www.javascriptlint.com/>`_ your code:
-
-   .. code-block:: bash
-
-     $ yarn grunt lint
 
 Contribution guidelines
 =======================
 
 Please follow the contribution guidelines on `the repository <https://github.com/portainer/portainer/blob/develop/CONTRIBUTING.md>`_.
+
+
+Contributing to the documentation
+=================================
+
+Checkout the project and go inside the root directory:
+
+.. code-block:: bash
+
+  $ git clone https://github.com/portainer/portainer-docs.git
+  $ cd portainer-docs
+
+
+Update the documentation and trigger a local build:
+
+.. code-block:: bash
+
+  $ docker run --rm -v ${PWD}/docs:/src portainer/docbuilder:latest make html
+
+This will create a local folder :file:`docs/build/html` where you will find the generated static files for the documentation.