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

blog/odoo-20-community-is-here-and-it-feels-like-a-genuinely-polished-release.html

@@ -67,6 +67,7 @@
       <a href="mailto:oliver@oc-guy.com">Email</a>
     </nav>
   </div>
+  <p class="sponsor-foot">Our Sponsor: <a href="https://ODOO4projects.com/?utm_source=oc-guy.com&amp;utm_medium=website&amp;utm_campaign=odoo-20-community-is-here-and-it-feels-like-a-genuinely-polished-release" target="_blank" rel="noopener sponsored">Awesome Odoo Community Hosting</a></p>
 </footer>
 </body>
 </html>

blog/paraguay-s-odoo-localization-is-updated-to-v19-and-that-matters-more-than-it-sou.html

@@ -51,6 +51,7 @@
       <a href="mailto:oliver@oc-guy.com">Email</a>
     </nav>
   </div>
+  <p class="sponsor-foot">Our Sponsor: <a href="https://ODOO4projects.com/?utm_source=oc-guy.com&amp;utm_medium=website&amp;utm_campaign=paraguay-s-odoo-localization-is-updated-to-v19-and-that-matters-more-than-it-sou" target="_blank" rel="noopener sponsored">Awesome Odoo Community Hosting</a></p>
 </footer>
 </body>
 </html>

scripts/sync_posts.py

@@ -248,6 +248,7 @@ POST_PAGE = """<!DOCTYPE html>
       <a href="mailto:oliver@oc-guy.com">Email</a>
     </nav>
   </div>
+  <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>
 </footer>
 </body>
 </html>