adds upcoming changes banner to homepage (cherry-picked change for MaPP v1 production environment) [MRXN23-560]

[hotzevzl]

Substitute this line for a meaningful title for your changes

Overview

Adds notice banner for upcoming changes, for MaPP v1 (currently only used in the TNC production environment)

Designs

N/A

Testing instructions

Banner should be shown in production when enabled via feature flag. Nothing else should break 🙏🏼 .

Feature relevant tickets

https://vizzuality.atlassian.net/browse/MRXN23-560

---

Checklist before submitting

• Meaningful commits and code rebased on develop.
• If this PR adds feature that should be tested for regressions when
  deploying to staging/production, please add brief testing instructions
  to the deploy checklist (docs/deployment-checklist.md)
• Update CHANGELOG file

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
marxan	❌ Failed (Inspect)		Jan 18, 2024 3:47pm

[hotzevzl]

@andresgnlez this is what I think we need in order to add the notice banner for the upcoming MaPP release to the production instance - could you please cross-check that I didn't do anytyhing silly here?

The vercel deploy triggered as part of this PR's actions is failing because we are feeding the Vercel build the old and obsolete Node version from our package.json - though this should not be a problem in production as we just keep running what we have there in terms of Node runtime version.

[agnlez]

@hotzevzl yes, this is perfect, thanks Andrea!

And yes, I received the fail notification from Vercel, we should probably shut down that instance as it is not being used, AFAIK, but that's a battle for another day :D