docs: update text alignment on progress banner for github, sponsor text

Author: egil

docs/site/sponsors/progress-ad-2022-dark-mode.svg

@@ -6,7 +6,7 @@
       <a href="https://www.telerik.com/blazor-ui?utm_source=egilhansen&utm_medium=cpm&utm_campaign=blazor-trial-readme-sponsored-message">
         <img width="200" src="/sponsors/progress-blazor-2022-300x300.png" />
       </a>
-      <p>Support provided by <a href="https://www.telerik.com/blazor-ui?utm_source=egilhansen&utm_medium=cpm&utm_campaign=blazor-trial-readme-sponsored-message" title="Progress Telerik">Progress Telerik</a>.</p>
+      <p>Premium sponsor: <a href="https://www.telerik.com/blazor-ui?utm_source=egilhansen&utm_medium=cpm&utm_campaign=blazor-trial-readme-sponsored-message" title="Progress Telerik">Progress Telerik</a>.</p>
     </div>
     <div class="supported">
       <a href="https://www.packtpub.com/" title="Packt">