Move refresh timer to page header

[Graham Gray]

I think it would be better if the refresh timer in the page's header so that it's always on the page. With regular profit switching you can end up with a long list of mined coins which requires that you scroll down the page to view, so you lose the refresh timer.

[James Dimitrov]

Fixed #6 Fixed #22

→ <<cset 627becb8b956>>