update microgrowth app link

Author: sambra95

docs/index.html

@@ -210,7 +210,7 @@ <h2>MicroGrowth</h2>
           </p>
           <a
             class="button"
-            href="https://thegrowthanalysisapp.streamlit.app/"
+            href="https://microgrowth.streamlit.app/"
             target="_blank"
             rel="noopener noreferrer"
             >Open MicroGrowth</a