Implement better pagination widgets in ScanCode.io

From https://github.com/aboutcode-org/vulnerablecode/issues/1617

This issue is also for SCIO

Shared by a shy user through a private email:

> BTW, I just ran into the pager on Vulnerable Code, this could be improved:
>
> https://public.vulnerablecode.io/packages/search?page=2&search=sudo
>
> If you want to go to page 45 of results, you have to visit each and every single page before it by pressing next 44 times...
>