stop contributors to edit page

https://blog.splibrarian.com/2014/04/20/disable-edit-link/

el problema es que por defecto los usuarios en 2013 tienen permiso contribute en la librería "site pages", hay que dejar de heredar y modificar esos permisos..

Here are the steps to modify the permissions for your Site Pages library:

Go to your site.
Click on Gear > Site contents.
Find and click on your Site Pages library.
Click on the Library tab and then click on the Library Settings button.
Click on the Permissions for this document library link.
Click on the Stop Inheriting Permissions button on the page’s toolbar.
Say OK to confirm you want to customize the permissions for this library.
Modify the library’s permissions as desired.
TIP: Make sure you give users read access to your Site Pages library. This will ensure they can see and access your site’s home page.