chore: update UTM tracking for Euronodes

BACKERS.md

@@ -36,7 +36,7 @@ PostgREST ongoing development is only possible thanks to our Sponsors and Backer
         </a>
       </td>
       <td align="center" valign="middle">
-        <a href="https://euronodes.com/?utm_source=sponsor&utm_campaign=postgrest" target="_blank">
+        <a href="https://www.euronodes.com/postgrest" target="_blank">
           <img width="296px" src="static/euronodes.svg">
         </a>
       </td>

README.md

@@ -45,7 +45,7 @@ API than you are likely to write from scratch.
         </a>
       </td>
       <td align="center" valign="middle">
-        <a href="https://gnuhost.eu/?utm_source=sponsor&utm_campaign=postgrest" target="_blank">
+        <a href="https://www.euronodes.com/postgrest" target="_blank">
           <img width="296px" src="static/euronodes.svg">
         </a>
       </td>

docker-hub-readme.md

@@ -42,7 +42,7 @@ write from scratch.
         </a>
       </td>
       <td align="center" valign="middle">
-        <a href="https://gnuhost.eu/?utm_source=sponsor&utm_campaign=postgrest" target="_blank">
+        <a href="https://www.euronodes.com/postgrest" target="_blank">
           <img width="296px" src="static/euronodes.svg">
         </a>
       </td>

docs/index.rst

@@ -76,12 +76,12 @@ Sponsors
   .. container:: img-dark
 
     .. image:: ../static/euronodes.svg
-      :target: https://euronodes.com/?utm_source=sponsor&utm_campaign=postgrest
+      :target: https://www.euronodes.com/postgrest
 
   .. container:: img-light
 
     .. image:: ../static/euronodes.svg
-      :target: https://euronodes.com/?utm_source=sponsor&utm_campaign=postgrest
+      :target: https://www.euronodes.com/postgrest
 
   .. 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.