fix: docs

invenio_theme/__init__.py

@@ -27,7 +27,6 @@
 
 >>> from flask import Flask, render_template_string
 >>> from invenio_theme import InvenioTheme
->>> from flask_menu import register_menu
 >>> app = Flask('myapp')
 >>> theme = InvenioTheme(app)
 
@@ -421,9 +420,8 @@ def init_config(app):
 For instance if you want to plug an menu item in the navigation bar you can do
 it like this:
 
->>> from flask_menu import register_menu
+>>> menu.submenu(".main.myitem").register("myview2", "My item", order=1)
 >>> @app.route('/myview2')
-... @register_menu(app, 'main.myitem', 'My item', order=1)
 ... def myview2():
 ...     return ""
 
@@ -459,8 +457,8 @@ def init_config(app):
 
 .. code-block:: python
 
+    menu.submenu(".settings.item1").register("settings_item_1", "Item 1", order=2)
     @app.route('/settings/')
-    @register_menu(app, 'settings.item1', 'Item 1', order=2)
     def settings_item_1():
         return render_template('invenio_foo/foo_settings.html')