Update source locations

There was an extra /

page-inserts/navbar.html

@@ -1,7 +1,7 @@
 <div class="mdc-drawer__content">
     <nav class="mdc-list">
         <div style="margin: 15px;text-align:center;">
-            <img src="//images/page-logo.png" style="width: 90%;"/>
+            <img src="/images/page-logo.png" style="width: 90%;"/>
         </div>
       <a class="mdc-list-item" href="https://reading-school.co.uk">
             <i class="material-icons mdc-list-item__graphic" aria-hidden="true">home</i>