docs(contributing): remove to use org-level file instead [skip ci]

* Automated using https://github.com/myii/ssf-formula/pull/70

docs/CONTRIBUTING.rst

-.. _contributing:
-
-How to contribute
-=================
-
-This document will eventually outline all aspects of guidance to make your contributing experience a fruitful and enjoyable one.
-What it already contains is information about *commit message formatting* and how that directly affects the numerous automated processes that are used for this repo.
-It also covers how to contribute to this *formula's documentation*.
-
-.. contents:: **Table of Contents**
-
-Overview
---------
-
-Submitting a pull request is more than just code!
-To achieve a quality product, the *tests* and *documentation* need to be updated as well.
-An excellent pull request will include these in the changes, wherever relevant.
-
-Commit message formatting
--------------------------
-
-Since every type of change requires making Git commits,
-we will start by covering the importance of ensuring that all of your commit
-messages are in the correct format.
-
-Automation of multiple processes
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This formula uses `semantic-release <https://github.com/semantic-release/semantic-release>`_ for automating numerous processes such as bumping the version number appropriately, creating new tags/releases and updating the changelog.
-The entire process relies on the structure of commit messages to determine the version bump, which is then used for the rest of the automation.
-
-Full details are available in the upstream docs regarding the `Angular Commit Message Conventions <https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#-git-commit-guidelines>`_.
-The key factor is that the first line of the commit message must follow this format:
-
-.. code-block::
-
-   type(scope): subject
-
-
-* E.g. ``docs(contributing): add commit message formatting instructions``.
-
-Besides the version bump, the changelog and release notes are formatted accordingly.
-So based on the example above:
-
-..
-
-   .. raw:: html
-
-      <h3>Documentation</h3>
-
-   * **contributing:** add commit message formatting instructions
-
-
-* The ``type`` translates into a ``Documentation`` sub-heading.
-* The ``(scope):`` will be shown in bold text without the brackets.
-* The ``subject`` follows the ``scope`` as standard text.
-
-Linting commit messages in Travis CI
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This formula uses `commitlint <https://github.com/conventional-changelog/commitlint>`_ for checking commit messages during CI testing.
-This ensures that they are in accordance with the ``semantic-release`` settings.
-
-For more details about the default settings, refer back to the ``commitlint`` `reference rules <https://conventional-changelog.github.io/commitlint/#/reference-rules>`_.
-
-Relationship between commit type and version bump
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-This formula applies some customisations to the defaults, as outlined in the table below,
-based upon the `type <https://github.com/angular/angular.js/blob/master/DEVELOPERS.md#type>`_ of the commit:
-
-.. list-table::
-   :name: commit-type-vs-version-bump
-   :header-rows: 1
-   :stub-columns: 0
-   :widths: 1,2,3,1,1
-
-   * - Type
-     - Heading
-     - Description
-     - Bump (default)
-     - Bump (custom)
-   * - ``build``
-     - Build System
-     - Changes related to the build system
-     - –
-     -
-   * - ``chore``
-     - –
-     - Changes to the build process or auxiliary tools and libraries such as
-       documentation generation
-     - –
-     -
-   * - ``ci``
-     - Continuous Integration
-     - Changes to the continuous integration configuration
-     - –
-     -
-   * - ``docs``
-     - Documentation
-     - Documentation only changes
-     - –
-     - 0.0.1
-   * - ``feat``
-     - Features
-     - A new feature
-     - 0.1.0
-     -
-   * - ``fix``
-     - Bug Fixes
-     - A bug fix
-     - 0.0.1
-     -
-   * - ``perf``
-     - Performance Improvements
-     - A code change that improves performance
-     - 0.0.1
-     -
-   * - ``refactor``
-     - Code Refactoring
-     - A code change that neither fixes a bug nor adds a feature
-     - –
-     - 0.0.1
-   * - ``revert``
-     - Reverts
-     - A commit used to revert a previous commit
-     - –
-     - 0.0.1
-   * - ``style``
-     - Styles
-     - Changes that do not affect the meaning of the code (white-space,
-       formatting, missing semi-colons, etc.)
-     - –
-     - 0.0.1
-   * - ``test``
-     - Tests
-     - Adding missing or correcting existing tests
-     - –
-     - 0.0.1
-
-Use ``BREAKING CHANGE`` to trigger a ``major`` version change
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-Adding ``BREAKING CHANGE`` to the footer of the extended description of the commit message will **always** trigger a ``major`` version change, no matter which type has been used.
-This will be appended to the changelog and release notes as well.
-To preserve good formatting of these notes, the following format is prescribed:
-
-* ``BREAKING CHANGE: <explanation in paragraph format>.``
-
-An example of that:
-
-.. code-block:: git
-
-   ...
-
-   BREAKING CHANGE: With the removal of all of the `.sls` files under
-   `template package`, this formula no longer supports the installation of
-   packages.
-