Restore banner for 2024 upgrade

[merc1er]

The contents of the upgrade page need to be updated accordingly:

@imaginaryusername let me know when you have this ready so I can update this PR.

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[imaginaryusername]

Can you adapt this?

Changelog: 

The only significant change this cycle is the Adaptive Blocksize Limit Algorithm. Read more [here](https://gitlab.com/0353F40E/ebaa/-/blob/main/README.md).

For node operators, upgrade to the latest version of a compatible node:

- Compatible, released: [Bitcoin Cash Node](https://bitcoincashnode.org)

- Yet to release a compatible version: Knuth, Bitcoin Verde, Bitcoin Unlimited, BCHD

[merc1er]

Done @imaginaryusername.

Let me know if this is correct: https://deploy-preview-207--bch.netlify.app/en/upgrade

[merc1er]

Please squash if you merge 👍🏻