Update Data prepper image, Add live playground link and rename Investigate to Discover (opensearch-project#126)

Author: ps48

.env

@@ -37,7 +37,7 @@ OTEL_COLLECTOR_PORT_HTTP=4318
 OTEL_COLLECTOR_METRICS_PORT=8888
 
 # Data Prepper Configuration
-DATA_PREPPER_VERSION=2.15.0-SNAPSHOT
+DATA_PREPPER_VERSION=2.15.0-SNAPSHOT-rc2
 DATA_PREPPER_DOCKER_REPO=sgguruda62324
 DATA_PREPPER_OTLP_PORT=21890
 DATA_PREPPER_HTTP_PORT=21892

docs/src/components/Hero.astro

@@ -31,7 +31,18 @@ import { CyclingTagline } from './CyclingTagline';
 
           <!-- Three CTAs with Hierarchy -->
           <div class="flex flex-col sm:flex-row gap-4 justify-center lg:justify-start items-center">
-            <!-- Primary CTA -->
+            <!-- Live Playground CTA -->
+            <a
+              href="https://observability.playground.opensearch.org"
+              target="_blank"
+              rel="noopener noreferrer"
+              class="cta-primary px-8 py-4 bg-gradient-to-r from-emerald-600 to-green-600 hover:from-emerald-500 hover:to-green-500 text-white font-bold rounded-lg transition-all duration-200 shadow-lg shadow-emerald-500/50 hover:shadow-emerald-500/70 hover:scale-105 backdrop-blur-sm"
+              data-analytics="cta_hero_live_playground"
+            >
+              Live Playground
+            </a>
+
+            <!-- View Docs CTA -->
             <a
               href="/docs/"
               class="cta-primary px-8 py-4 bg-gradient-to-r from-purple-600 to-pink-600 hover:from-purple-500 hover:to-pink-500 text-white font-bold rounded-lg transition-all duration-200 shadow-lg shadow-purple-500/50 hover:shadow-purple-500/70 hover:scale-105 backdrop-blur-sm"

docs/starlight-docs/astro.config.mjs

@@ -105,7 +105,7 @@ export default defineConfig({
 					],
 				},
 				{
-					label: 'Investigate',
+					label: 'Discover',
 					collapsed: true,
 					autogenerate: { directory: 'investigate' },
 				},

docs/starlight-docs/src/content/docs/index.mdx

@@ -20,6 +20,8 @@ OpenSearch Observability Stack is an **open-source, OpenTelemetry-native observa
 
 <video src="https://github.com/opensearch-project/observability-stack/releases/download/v3.6.0-alpha.1/observability-stack-overview.mp4" controls></video>
 
+<LinkCard title="Live Playground" href="https://observability.playground.opensearch.org" description="Try the Observability Stack live — no installation required." />
+
 ## Quickstarts
 
 <LinkCard title="Install & Explore" href="/docs/get-started/installation/" description="Install the stack and explore traces already flowing from the built-in example services." />