fix beta in title

Author: Bud-Macaulay

index.html

@@ -8,7 +8,7 @@
       name="description"
       content="The Materials Cloud OPTIMADE Client is a tool to search through databases exposing an OPTIMADE RESTful API."
     />
-    <title>Beta Optimade React Client</title>
+    <title>Optimade React Client</title>
 
     <!-- Plausible analytics -->
     <script type="text/javascript">