[e.cash] Modify featured articles

Summary:
As requested modifying the featured articles component to 6 articles

• The latest (non-monthly recap)
• Latest monthly recap
• and 4 handpicked posts controlled with an array of slugs

Also adjusting the styles of the card a bit. Now that we have 6, the read more buttons seemed too busy.
Losing those and adding some hover effects to the card. Smaller font-size for the titles as well

Test Plan: preview and check

Reviewers: #bitcoin_abc, Kronkmeister

Reviewed By: #bitcoin_abc, Kronkmeister

Subscribers: Kronkmeister

Differential Revision: https://reviews.bitcoinabc.org/D18744