Add Lyng string interpolation with docs/tests and refresh changelog

site/src/jsMain/resources/index.html

@@ -339,7 +339,7 @@
 <!-- Top-left version ribbon -->
 <div class="corner-ribbon bg-danger text-white">
         <span style="margin-left: -5em">
-            v1.5.0
+            v1.5.1
         </span>
 </div>
 <!-- Fixed top navbar for the whole site -->