Add custom template list example (paginated)

                                                                
|Q            |A                                               |
|---          |---                                             |
|Bug Fix?     |n                                               |
|New Feature? |y                                               |
|BC Breaks?   |n                                               |
|Deprecations?|n                                               |
|Tests Pass?  |n                                               |
|Fixed Tickets|                                                |
|License      |GPL-3                                           |
|Doc PR       |https://github.com/newscoop/newscoop-docs/pull/6|
                                                                

Add example for paginated custom templates list