Centre the sponsor line in the footer, cache-bust the stylesheet

scripts/sync_posts.py

@@ -214,7 +214,7 @@ POST_PAGE = """<!DOCTYPE html>
   window.plausible=window.plausible||function(){{(plausible.q=plausible.q||[]).push(arguments)}},plausible.init=plausible.init||function(i){{plausible.o=i||{{}}}};
   plausible.init()
 </script>
-<link rel="stylesheet" href="../css/site.css">
+<link rel="stylesheet" href="../css/site.css?v=20261024b">
 </head>
 <body>
 <header class="masthead">
@@ -242,7 +242,6 @@ POST_PAGE = """<!DOCTYPE html>
   <p class="foot-name" aria-hidden="true">The OC Guy</p>
   <div class="foot-cols">
     <p class="foot-note">Odoo Community advocate. Written by Oliver Arnold, 安雷威 — no partner programme, no licences sold.</p>
-    <p class="sponsor-foot">Our Sponsor: <a href="https://ODOO4projects.com/?utm_source=oc-guy.com&amp;utm_medium=website&amp;utm_campaign={sponsor_campaign}" target="_blank" rel="noopener sponsored">Awesome Odoo Community Hosting</a></p>
     <nav class="foot-links" aria-label="Elsewhere">
       <a href="../index.html">Home</a>
       <a href="https://github.com/OCA" target="_blank" rel="noopener">OCA modules</a>