[docs] Restructured Documentation

Restructured the documentation in a way that allows it to
be included in the Unified Documentation of OpenWISP.

For more information see openwisp/openwisp-docs#107.

docs/developer/index.rst

@@ -0,0 +1,16 @@
+Developer Docs
+==============
+
+.. include:: ../partials/developer-docs.rst
+
+.. toctree::
+    :maxdepth: 2
+
+    ./installation.rst
+    ./utils.rst
+    ./extending.rst
+
+Other useful resources:
+
+    - :doc:`../user/rest-api`
+    - :doc:`../user/settings`

docs/developer/installation.rst

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+Developer Installation Instructions
+===================================
+
+.. include:: ../partials/developer-docs.rst
+
+.. contents:: **Table of Contents**:
+    :depth: 2
+    :local:
+
+Dependencies
+------------
+
+- Python >= 3.8
+- OpenSSL
+
+Installing for Development
+--------------------------
+
+Install the system dependencies:
+
+.. code-block:: shell
+
+    sudo apt update
+    sudo apt install -y sqlite3 libsqlite3-dev openssl libssl-dev
+    sudo apt install -y gdal-bin libproj-dev libgeos-dev libspatialite-dev libsqlite3-mod-spatialite
+    sudo apt install -y chromium-browser
+
+Fork and clone the forked repository:
+
+.. code-block:: shell
+
+    git clone git://github.com/<your_fork>/openwisp-controller
+
+Navigate into the cloned repository:
+
+.. code-block:: shell
+
+    cd openwisp-controller/
+
+Launch Redis and PostgreSQL:
+
+.. code-block:: shell
+
+    docker-compose up -d redis postgres
+
+Setup and activate a virtual-environment (we'll be using `virtualenv
+<https://pypi.org/project/virtualenv/>`_):
+
+.. code-block:: shell
+
+    python -m virtualenv env
+    source env/bin/activate
+
+Make sure that your base python packages are up to date before moving to
+the next step:
+
+.. code-block:: shell
+
+    pip install -U pip wheel setuptools
+
+Install development dependencies:
+
+.. code-block:: shell
+
+    pip install -e .
+    pip install -r requirements-test.txt
+    sudo npm install -g jshint stylelint
+
+Install WebDriver for Chromium for your browser version from
+https://chromedriver.chromium.org/home and Extract ``chromedriver`` to one
+of directories from your ``$PATH`` (example: ``~/.local/bin/``).
+
+Create database:
+
+.. code-block:: shell
+
+    cd tests/
+    ./manage.py migrate
+    ./manage.py createsuperuser
+
+Launch celery worker (for background jobs):
+
+.. code-block:: shell
+
+    celery -A openwisp2 worker -l info
+
+Launch development server:
+
+.. code-block:: shell
+
+    ./manage.py runserver 0.0.0.0:8000
+
+You can access the admin interface at ``http://127.0.0.1:8000/admin/``.
+
+Run tests with:
+
+.. code-block:: shell
+
+    ./runtests.py --parallel
+
+Some tests, such as the Selenium UI tests, require a PostgreSQL database
+to run. If you don't have a PostgreSQL database running on your system,
+you can use :ref:`the Docker Compose configuration provided in this
+repository <controller_dev_docker>`. Once set up, you can run these
+specific tests as follows:
+
+.. code-block:: shell
+
+    # Run database tests against PostgreSQL backend
+    POSTGRESQL=1 ./runtests.py --parallel
+
+    # Run only specific selenium tests classes
+    cd tests/
+    DJANGO_SETTINGS_MODULE=openwisp2.postgresql_settings ./manage.py test openwisp_controller.config.tests.test_selenium.TestDeviceAdmin
+
+Run quality assurance tests with:
+
+.. code-block:: shell
+
+    ./run-qa-checks
+
+Alternative Sources
+-------------------
+
+Pypi
+~~~~
+
+To install the latest stable version from pypi:
+
+.. code-block:: shell
+
+    pip install openwisp-controller
+
+Github
+~~~~~~
+
+To install the latest development version tarball via HTTPs:
+
+.. code-block:: shell
+
+    pip install https://github.com/openwisp/openwisp-controller/tarball/master
+
+Alternatively you can use the git protocol:
+
+.. code-block:: shell
+
+    pip install -e git+git://github.com/openwisp/openwisp-controller#egg=openwisp_controller
+
+.. _controller_dev_docker:
+
+Install and Run on Docker
+-------------------------
+
+.. warning::
+
+    This Docker image is for development purposes only.
+
+    For the official OpenWISP Docker images, see: :doc:`docker-openwisp
+    </docker/index>`.
+
+Build from the Dockerfile:
+
+.. code-block:: shell
+
+    docker-compose build
+
+Run the docker container:
+
+.. code-block:: shell
+
+    docker-compose up
+
+Troubleshooting Steps for Common Installation Issues
+----------------------------------------------------
+
+You may encounter some issues while installing GeoDjango.
+
+Unable to Load SpatiaLite library Extension?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you are incurring in the following exception:
+
+.. code-block::
+
+    django.core.exceptions.ImproperlyConfigured: Unable to load the SpatiaLite library extension
+
+You need to specify ``SPATIALITE_LIBRARY_PATH`` in your ``settings.py`` as
+explained in `django documentation regarding how to install and configure
+spatialte
+<https://docs.djangoproject.com/en/2.1/ref/contrib/gis/install/spatialite/>`_.
+
+Having Issues with Other Geospatial Libraries?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Please refer `troubleshooting issues related to geospatial libraries
+<https://docs.djangoproject.com/en/2.1/ref/contrib/gis/install/#library-environment-settings/>`_.
+
+.. important::
+
+    If you want to add OpenWISP Controller to an existing Django project,
+    then you can refer to the `test project in the openwisp-controller
+    repository
+    <https://github.com/openwisp/openwisp-controller/tree/master/tests/openwisp2>`_.