Proposal: Add pagination to tags page

[knopka]

Hi folks,
is it possible to add pagination for repo/tags page? Currently application displays all images from repo on a single page and I can see problems with big repos. We have huge repos with thousands images and tags page creation for repo with approximately 12000 images takes 50min :). So, perhaps pagination can fix this issue.

Thanks!

[jessfraz]

PRs welcome :)

[knopka]

I'm not a golang expert, but done, please take a look #116.