Add Netlify logo to footer sitewide

Author: stevepiercy

docs/conf.py

@@ -183,7 +183,10 @@
         <a href="https://plone.org">
             <img src="/_static/logo.svg" alt="plone.org" /> plone.org</a>
     </p>""",
-    "extra_footer": """The text and illustrations in this website are licensed by the Plone Foundation under a Creative Commons Attribution 4.0 International license. Plone and the Plone® logo are registered trademarks of the Plone Foundation, registered in the United States and other countries. For guidelines on the permitted uses of the Plone trademarks, see <a href="https://plone.org/foundation/logo">https://plone.org/foundation/logo</a>. All other trademarks are owned by their respective owners.""",
+    "extra_footer": """<p>The text and illustrations in this website are licensed by the Plone Foundation under a Creative Commons Attribution 4.0 International license. Plone and the Plone® logo are registered trademarks of the Plone Foundation, registered in the United States and other countries. For guidelines on the permitted uses of the Plone trademarks, see <a href="https://plone.org/foundation/logo">https://plone.org/foundation/logo</a>. All other trademarks are owned by their respective owners.</p>
+    <p><a href="https://www.netlify.com">
+  <img src="https://www.netlify.com/img/global/badges/netlify-color-bg.svg" alt="Deploys by Netlify" />
+</a></p>""",
 }
 
 # The name for this set of Sphinx documents.  If None, it defaults to