* [misc] remove doc migrate guide.

module/doc/js/common.ui.js

@@ -351,10 +351,3 @@ window.checkLibPriv = function(e)
         $inputGroupBox.append("<div class='notice pt-1'>" + data + '</div>');
     });
 }
-
-/* Try to migrate docs content. */
-if(['index', 'app', 'quick'].includes(config.currentMethod) && !zui.store.session.get('docMigrateTip'))
-{
-    zui.DocApp.tryMigrateDocs();
-    zui.store.session.set('docMigrateTip', true);
-}

module/index/js/index.ui.js

@@ -1420,11 +1420,3 @@ function canAddDivider($item)
     if($item.is(':last-child'))     return false;
     return true;
 }
-
-/* Check docs data for last upgrade. */
-const lastUpgrade = zui.store.get('lastUpgrade');
-if(lastUpgrade)
-{
-    zui.DocApp.tryMigrateDocs();
-    zui.store.remove('lastUpgrade');
-}