Menutree external dynamic link for Content updated

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | optimization of code
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Fixed tickets | -
| Refs tickets  | -
| License       | MIT
| Doc PR        | -

Including less API calls during Content_Page_getPages, otherwise too much API's get called where this is not necessary and increases load times ! Only titles and links are needed for Menutree to generate the menu.