[e.cash] Add Kryptex mining pool to e.cash/mining page
Summary: Adding Kryptex mining pool to e.cash/mining page
Test Plan: visit e.cash/mining
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D17850