sponsors: add grafana

Author: gerryd

content/sponsors/grafana-big.png

@@ -0,0 +1,12 @@
+---
+title: Grafana Labs
+url: https://grafana.com/
+cornerstone: false
+---
+
+Grafana Labs delivers the open observability cloud. Trusted by 25M+
+users and 7,000+ customers – including Anthropic, and NVIDIA  – we
+help organizations see, understand, and act on their data so they
+can move at the speed of their ambitions.
+
+Grafana Labs supports the event financially.