docs: add dark mode

- Uses sphinx-rtd-dark-mode for sphinx-rtd-theme
- Adds dark mode logos for sponsors

docs/index.rst

@@ -34,38 +34,59 @@ Sponsors
 
 .. container:: image-container
 
-  .. image:: ../static/cybertec-new.png
-    :target: https://www.cybertec-postgresql.com/en/?utm_source=postgrest.org&utm_medium=referral&utm_campaign=postgrest
-    :width:  13em
+  .. container:: img-dark
+
+    .. image:: ../static/cybertec-dark.svg
+      :target: https://www.cybertec-postgresql.com/en/?utm_source=postgrest.org&utm_medium=referral&utm_campaign=postgrest
+
+  .. container:: img-light
+
+    .. image:: ../static/cybertec-new.png
+      :target: https://www.cybertec-postgresql.com/en/?utm_source=postgrest.org&utm_medium=referral&utm_campaign=postgrest
 
   .. image:: ../static/gnuhost.png
     :target: https://gnuhost.eu/?utm_source=sponsor&utm_campaign=postgrest
-    :width:  13em
 
-  .. image:: ../static/neon.jpg
-    :target: https://neon.tech/?utm_source=sponsor&utm_campaign=postgrest
-    :width:  13em
+  .. container:: img-dark
+
+    .. image:: ../static/neon-dark.jpg
+      :target: https://neon.tech/?utm_source=sponsor&utm_campaign=postgrest
+
+  .. container:: img-light
+
+    .. image:: ../static/neon.jpg
+      :target: https://neon.tech/?utm_source=sponsor&utm_campaign=postgrest
 
   |
 
-  .. image:: ../static/code-build.webp
-    :target: https://code.build/?utm_source=sponsor&utm_campaign=postgrest
-    :width:  13em
+  .. container:: img-dark
 
-  .. image:: ../static/supabase.png
-    :target: https://supabase.com/?utm_source=postgrest%20backers&utm_medium=open%20source%20partner&utm_campaign=postgrest%20backers%20github&utm_term=homepage
-    :width:  13em
+    .. image:: ../static/code-build-dark.png
+      :target: https://code.build/?utm_source=sponsor&utm_campaign=postgrest
+
+  .. container:: img-light
+
+    .. image:: ../static/code-build.webp
+      :target: https://code.build/?utm_source=sponsor&utm_campaign=postgrest
+
+  .. container:: img-dark
+
+    .. image:: ../static/supabase-dark.png
+      :target: https://supabase.com/?utm_source=postgrest%20backers&utm_medium=open%20source%20partner&utm_campaign=postgrest%20backers%20github&utm_term=homepage
+
+  .. container:: img-light
+
+    .. image:: ../static/supabase.png
+      :target: https://supabase.com/?utm_source=postgrest%20backers&utm_medium=open%20source%20partner&utm_campaign=postgrest%20backers%20github&utm_term=homepage
 
   .. image:: ../static/tembo.png
     :target: https://tembo.io/?utm_source=sponsor&utm_campaign=postgrest
-    :width:  13em
 
   .. The static/empty.png(created with `convert -size 320x95 xc:#fcfcfc empty.png`) is an ugly workaround
      to create space and center the logos. It's not easy to layout with restructuredText.
 
   .. .. image:: _static/empty.png
        :target: #sponsors
-       :width:  13em
 
 |