fix: update getting started link

README.md

@@ -2,7 +2,7 @@
 <h1>zk</h1>
 <h4>A plain text note-taking assistant</h4>
 <img alt="Screencast" width="95%" src="docs/assets/media/screencast.svg"/>
-<p>Looking for a quick usage example? <a href="getting-started.md">Let's get started</a>.</p>
+<p>Looking for a quick usage example? <a href="docs/getting-started.md">Let's get started</a>.</p>
 </div>
 
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