Frontend: pagination should use Bootstrap styles

[robbieaverill]

We should use Bootstrap button styles for the pagination.

Something like this: https://getbootstrap.com/docs/3.3/components/#default-example

Perhaps we could also make the two links in the screenshot into action buttons too.

[robbieaverill]

PR at #192

[ScopeyNZ]

#192 is merged but I think there's a further enhancement that can be done here to use the pagination component in some way:

https://reactstrap.github.io/components/pagination/

The silverstripe/silverstripe-registry component uses this already:

I still merged the PR as it felt like a worthy improvement. Should we raise this as a separate enhancement or do you think we should leave this issue open to accept another PR?

[robbieaverill]

It's up to you. I don't think we necessarily need to match the Bootstrap component, but at least this doesn't look heinous any more

[robbieaverill]

I'll change this into an enhancement for future