Move and rewrite content from `CONTRIBUTING.md` to `docs/contributing.rst`.

CONTRIBUTING.md

@@ -1,42 +1,3 @@
 # Contributing
 
-See our [contributing guidelines](https://icalendar.readthedocs.io/en/latest/contributing.html) for complete information on how to contribute to icalendar.
-
-## Contribution examples
-
-- Reporting issues to the bugtracker.
-- Submitting pull requests from a forked icalendar repo.
-- Extending the documentation.
-- Sponsor a Sprint (https://plone.org/events/sprints/whatis).
-
-## Pull request requirements
-
-> [!IMPORTANT]
-> Every pull request must include a change log entry.
-
-Before submitting your pull request, ensure you have met the following requirements.
-
-1. **Add a changelog entry to `CHANGES.rst`** - This is required and enforced by CI
-2. Add a test which proves your fix and make it pass  
-3. Add yourself to `docs/credits.rst`
-
-### Changelog entry format
-
-Add your entry under the appropriate section in `CHANGES.rst`:
-
-- **Minor changes:** For small improvements, refactoring, documentation updates
-- **Breaking changes:** For changes that break existing API
-- **New features:** For new functionality
-- **Bug fixes:** For bug fixes and error corrections
-
-Example:
-
-```
-Minor changes:
-
-- Fix issue with timezone parsing in special cases. See `Issue XXX <link>`_.
-```
-
-## Setup for development
-
-If you would like to setup icalendar to contribute changes, the [Installation Section](https://icalendar.readthedocs.io/en/latest/install.html) should help you further.
+See our [contributing guide](https://icalendar.readthedocs.io/en/latest/contributing.html) for complete information on how to contribute to icalendar.

docs/contributing.rst

@@ -1,5 +1,60 @@
-------------------
 Contributing
-------------------
+============
 
-.. include:: ../CONTRIBUTING.rst
+This guide describes how to contribute to icalendar.
+
+Examples of how to contribute
+-----------------------------
+
+-   Report issues to the bugtracker.
+-   Submit pull requests from your fork of the icalendar repository.
+-   Extend the documentation.
+-   Sponsor development of icalendar through [Open Collective](https://opencollective.com/python-icalendar).
+
+
+Pull request requirements
+-------------------------
+
+Before submitting your pull request, ensure you have met the following requirements.
+
+#.  Add a changelog entry to :file:`CHANGES.rst`.
+    This is required and enforced by CI.
+    See :ref:`change-log` for details.
+#.  Add a test which proves your fix and passes.
+#.  Run all tests to ensure your changes don't break any existing functionality.
+#.  Add or edit documentation, both as docstrings to be rendered in the API documentation and narrative documentation, as necessary.
+#.  Add yourself to :file:`docs/credits.rst`, if you haven't already done so.
+
+
+.. _change-log:
+
+Change log entry format
+```````````````````````
+
+Add your entry under the appropriate section in :file:`CHANGES.rst`.
+
+Minor changes
+    For small improvements, refactoring, and documentation updates.
+
+Breaking changes
+    For changes that break the existing API.
+
+New features
+    For new functionality.
+
+Bug fixes
+    For bug fixes and error corrections.
+
+Example:
+
+.. code-block:: rst
+
+    Minor changes:
+
+    - Fix issue with timezone parsing in special cases. See `Issue XXX <link>`_.
+
+
+Set up for development
+----------------------
+
+If you would like to set up icalendar to contribute changes, :doc:`install` should help you further.