Getting started docs version bump (#654)

Author: SachinVarghese

site-src/guides/index.md

@@ -58,7 +58,7 @@ This quickstart guide is intended for engineers familiar with k8s and model serv
 === "Latest Release"
 
       ```bash
-      VERSION=v0.2.0
+      VERSION=v0.3.0
       kubectl apply -f https://github.com/kubernetes-sigs/gateway-api-inference-extension/releases/download/$VERSION/manifests.yaml
       ```