Update link for RGB example (#273)

Author: ConorOkus

docs/case-studies.md

@@ -189,8 +189,8 @@ lastUpdated: false
           <p>An experimentation with tor that adapts the ldk-sample node</p>
         </div>
         <div class="case-study-item">
-          <a href="https://github.com/RGB-Tools/rgb-lightning-sample" target="_blank"><img src="./assets/github.png" /></a>
-          <h3><a href="https://github.com/RGB-Tools/rgb-lightning-sample" target="_blank">rgb-lightning-sample</a></h3>
+          <a href="https://github.com/RGB-Tools/rgb-lightning-node" target="_blank"><img src="./assets/github.png" /></a>
+          <h3><a href="https://github.com/RGB-Tools/rgb-lightning-node" target="_blank">rgb-lightning-node</a></h3>
           <p>LN node based on ldk-sample supporting RGB assets</p>
         </div>
          <div class="case-study-item">