docs(sponsors): add Seibert Group sponsor

content/docs/get-started/sponsors.mdx

@@ -32,6 +32,17 @@ We have amazing sponsors who support the development of Coolify.
   </div>
 </div>
 </a>
+<a href="https://seibert.link/coolifysoftware?ref=coolify.io" className="rounded-lg border border-fd-border bg-fd-card p-6 no-underline transition hover:border-fd-primary/60 hover:bg-fd-muted/40">
+<div className="flex h-full min-h-56 flex-col items-center justify-center gap-5 text-center">
+  <div className="flex h-20 w-full items-center justify-center">
+    <img src="/docs/images/sponsors/seibert.png" alt="Seibert Group logo" className="max-h-20 w-full max-w-56 object-contain" />
+  </div>
+  <div className="min-w-0">
+    <p className="m-0 font-semibold text-fd-foreground">Seibert Group</p>
+    <p className="m-0 mt-2 text-sm leading-6 text-fd-muted-foreground">Boost productivity company-wide with AI agents like Claude Code</p>
+  </div>
+</div>
+</a>
 <a href="https://screenshotone.com?ref=coolify.io" className="rounded-lg border border-fd-border bg-fd-card p-6 no-underline transition hover:border-fd-primary/60 hover:bg-fd-muted/40">
 <div className="flex h-full min-h-56 flex-col items-center justify-center gap-5 text-center">
   <div className="flex h-20 w-full items-center justify-center">