Rename flex-grow to grow

internal/assets/templates/page.html

@@ -29,7 +29,7 @@
     <div class="header flex padding-inline-widget widget-content-frame">
         <!-- TODO: Replace G with actual logo, first need an actual logo -->
         <div class="logo">G</div>
-        <div class="nav flex flex-grow">
+        <div class="nav flex grow">
             {{ template "navigation-links" . }}
         </div>
     </div>