docs: add pagination JavaScript examples

[w0whitaker]

This PR includes some of the JavaScript examples that are missing from the docs.

1. Paging an Object
2. Paginate a global or local data file
3. Aliasing to a different variable
4. Paging a Collection

[Snapstromegon]

Thanks a lot @w0whitaker I just did some minor touch ups and now I think this is good to go!
By the way, I just checked and it seems like formatting is a problem in this repo right now, so I created #1670, so thanks for bringing this issue up with your first PR attempt. You did everything right there and the problem is, that this repo is right now formatted as configured.