update homepage and event notification for 2026 user survey

[magdmartin]

As part of the https://forum.openrefine.org/t/drafting-the-2026-user-survey/2822/

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[magdmartin]

@tfmorris @Abbe98 I don't want to merge this until a Core Dev Group member approves it since it will notify all OpenRefine users. Thanks

[Abbe98]

The button breaks the layout on medium and small screens but it looks like it has been the case for the last few years.

Better getting this out there sooner than later but lets keep the issue in mind for the future.

[tfmorris]

One small grammar fix for the link label, but otherwise looks OK. I think the banner might work better at the top of the page, rather than buried in the middle, but I'm not a designer.

Not sure how to test the events.json, but we can fix it up later if there's an issue.

From a process point of view, it seems more like something that the project management committee needs to approve rather than the core developers, but I'm fine with reviewing too.

[magdmartin]

Thanks for the edit. To test the change, you need to edit this line in your local OpenRefine: https://github.com/OpenRefine/OpenRefine/blob/master/main/webapp/modules/core/scripts/index.js#L162 and replace https://openrefine.org/ with the Netlify URL for this PR, https://deploy-preview-593--openrefine-website.netlify.app/, in this case.