[e.cash] Open external links in new tab - mining page
Summary: Using the cusotm link component on the mining page so external links open in a new tab
Test Plan: Preview the site and check the links open in a new tab on the mining page
Reviewers: #bitcoin_abc, bytesofman
Reviewed By: #bitcoin_abc, bytesofman
Subscribers: bytesofman
Differential Revision: https://reviews.bitcoinabc.org/D14699