[11.0][IMP] document_page:

* move menus to a higher level.
 * fix categories search view.
 * fix create menu action not being accessible in any way.
 * reorder form view, focusing in the content, not in secondary fields.

document_page/models/document_page.py

@@ -85,7 +85,7 @@ class DocumentPage(models.Model):
     menu_id = fields.Many2one(
         'ir.ui.menu',
         "Menu",
-        readonly=True
+        readonly=True,
     )
 
     content_date = fields.Datetime(
@@ -181,3 +181,10 @@ class DocumentPage(models.Model):
         if not self.content or self.content == '<p><br></p>':
             if self.parent_id and self.parent_id.type == "category":
                     self.content = self.parent_id.template
+
+    @api.multi
+    def unlink(self):
+        menus = self.mapped('menu_id')
+        res = super().unlink()
+        menus.unlink()
+        return res