[e.cash] Add "Chronik" copy to Core-Tech.

Summary:
Added Chronik as a listed item to the core-tech page as it wasn't mentioned elsewhere.
Also swapped places of "eTokens" item, so that Avalanche, Staking,and Subnets are listed consecutively.

Test Plan: visit e.cash/core-tech and scroll down to "Chronik".

Reviewers: #bitcoin_abc, Mengerian

Reviewed By: #bitcoin_abc, Mengerian

Subscribers: Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D16141