Adds lightspark to default case study view (#263)

Author: ConorOkus

docs/case-studies.md

@@ -278,6 +278,11 @@ lastUpdated: false
     <a href="https://github.com/lexe-tech" target="_blank"> <img src="./assets/lexe.png" /></a>
     <h3><a href="https://github.com/lexe-tech" target="_blank">Lexe</a></h3>
     <p>Managed non-custodial Lightning nodes inside secure hardware</p>
+  </div>
+   <div class="case-study-item">
+    <a href="https://www.lightspark.com/" target="_blank"> <img src="./assets/lightspark.png" /></a>
+    <h3><a href="https://www.lightspark.com/" target="_blank">Lightspark</a></h3>
+    <p>Enterprise-grade, fast, secure payments on Lightning</p>
   </div>
   <div class="case-study-item">
     <a href="https://github.com/lndk-org/lndk" target="_blank"><img src="./assets/lndk.png" /></a>