remove excel from Export description

Author: rrelyea

Pages/Home.razor

@@ -51,7 +51,7 @@ else
     <a href='/export'>
         <span style="margin:3px;font-Size:24pt">⬇️</span>
         Export Center</a><br/>
-        <span style="foreground:black">export portfolio to Excel, Sheets, or CSV</span>
+        <span style="foreground:black">export portfolio to Google Sheets via CSV file</span>
 </p>        
 <p>
     <a href='/profiles'>