Docs: Add SQL Server card for Hub

SQL Server is now available on the connector hub; this adds a card to alert docs users to its availability.

docs/connectors/overview.mdx

@@ -33,6 +33,7 @@ import Yugabyte from "@site/static/img/databases/logos/yugabyte.png";
 import Aurora from "@site/static/img/databases/logos/aurora.png";
 import CRDB from "@site/static/img/databases/logos/crdb.png";
 import Citus from "@site/static/img/databases/logos/citus.png";
+import SqlServer from "@site/static/img/databases/logos/sql-server.png";
 import Timescale from "@site/static/img/databases/logos/timescale.webp";
 import Link from "@docusaurus/Link";
 
@@ -183,9 +184,18 @@ what's coming up on the roadmap.
 <Link href={"/connectors/clickhouse"}>
     <div className="vendor-card-wrapper">
       <div className="vendor-card">
-        <img src={ClickHouse} title="PostgreSQL" alt="Connect PostgreSQL to Hasura DDN" />
+        <img src={ClickHouse} title="PostgreSQL" alt="Connect ClickHouse to Hasura DDN" />
       </div>
       <h5>ClickHouse</h5>
     </div>
   </Link>
+  <!-- SQL Server -->
+<Link href={"https://hasura.io/connectors/sqlserver"}>
+    <div className="vendor-card-wrapper">
+      <div className="vendor-card">
+        <img src={SqlServer} title="SQL Server" alt="Connect SQL Server to Hasura DDN" />
+      </div>
+      <h5>SQL Server</h5>
+    </div>
+  </Link>
 </div>