feature: add Node.js Interactive at RenderATL banner

[yaya1441415]

Description

Adds a website banner announcing Node.js Interactive at RenderATL, August 12-13, 2026.
The banner links to the registration page and will display site-wide until the event ends.

Validation

Banner appears at the top of all pages when visiting the site locally via pnpm dev.

Related Issues

Closes #8957

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [ x] I have run pnpm format to ensure the code follows the style guide.
• [ x] I have run pnpm test to check if all tests are passing.
• [ x] I have run pnpm build to check if the website builds without errors.
• [ x] I've covered new added functionality with unit tests if necessary.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jun 16, 2026 9:49pm

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PR Summary

Low Risk
Config-only banner content in site.json with no application logic changes.

Overview
Replaces the homepage March Security Release site-wide banner with promotion for Node.js Interactive at RenderATL (August 12–13, 2026).

In apps/site/site.json, the websiteBanners.index entry now uses a June 16–August 13, 2026 display window, new copy and a RenderATL tickets link, and banner type default instead of warning.

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Banner ends before event day

Medium Severity

The banner’s endDate stops display once UTC rolls to August 14, but the copy advertises RenderATL on August 12–13 in Atlanta. Because dateIsBetween treats the end as exclusive, visitors in US Eastern time can lose the banner for much of the evening on the 13th while the event is still underway locally.

 

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[MattIPv4]

Security releases are scheduled for tomorrow: https://nodejs.org/en/blog/vulnerability/june-2026-security-releases -- these will need a banner that is higher priority than Node.js Interactive. I think we probably want to hold off on this promotion until a couple of weeks time, once the security releases have settled?