Make the tabs on Pools and Voucher linkable

[WillRuddick]

Similar to https://sarafu.network/wallet?tab=activity

https://sarafu.network/pools/0xC5D87CaaA2Ba122C423911c62b6f490288301Cb6?tab=settings

Also allow ens to work https://sarafu.network/pools/foopool.sarafu.eth?tab=settings