Update index.md

Author: mitchpolygon

docs/index.md

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-						<h1 class="hero-heading">CDK PP Docs Review Environment</h1>
+						<h1 class="hero-heading">The Polygon Knowledge Layer</h1>
 						<p class="hero-subtext">Welcome to the technical documentation and knowledge resources for Polygon protocols and scaling technologies.</p>
 						<p class="hero-subtext"> Learn how to build and deploy dApps, launch ZK rollups and validiums as Layer 2s on Ethereum, spin up nodes, and find out about the latest in zero-knowledge research.</p>
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