Add instructions where to get PS to start screen

obelisk/frontend/src/Pages/FirstRun.hs

@@ -20,6 +20,7 @@ firstRunPage = do
         elClass "div" "subtext mdc-typography--body2" $ do
           el "p" $ text "This app requires access to PrivateStorage."
           el "p" $ text "Please ensure the PrivateStorage desktop app is installed and running before proceeding."
+          el "p" $ text "Visit https://private.storage/ on your desktop or laptop computer to get started."
 
         (readyButton, _) <- elAttr' "button" ("class" =: "mdc-button mdc-button--raised" <> "data-mdc-auto-init" =: "MDCRipple") $ do
           elClass "span" "mdc-button__ripple" blank