Synced donation section in the docs to celery (#454)

Author: Nusnus

docs/index.rst

@@ -22,16 +22,14 @@ The pytest-celery plugin is Open Source and licensed under the `BSD License`_.
 
 .. _`BSD License`: https://www.opensource.org/license/BSD-3-Clause
 
-Donations
-=========
-
-This project relies on your generous donations.
-
-If you are using pytest-celery to test a commercial product, please consider becoming
-our `backer`_ or our `sponsor`_ to ensure pytest-celery's future.
-
-.. _`backer`: https://opencollective.com/celery
-.. _`sponsor`: https://opencollective.com/celery
+.. image:: https://opencollective.com/static/images/opencollectivelogo-footer-n.svg
+   :target: https://opencollective.com/celery
+   :alt: Open Collective logo
+   :width: 240px
+
+`Open Collective <https://opencollective.com/celery>`_ is our community-powered funding platform that fuels Celery's
+ongoing development. Your sponsorship directly supports improvements, maintenance, and innovative features that keep
+Celery robust and reliable.
 
 Getting Started
 ===============