feat: add previous and next navigation to contributor spotlight pages

[abhi-battula]

This PR implements Phase 2 of the #476 .

It adds Previous and Next navigation links to the bottom of the contributor detail page.
The navigation follows the same published date order used on the home page, so browsing between profiles is consistent and predictable.

[abhi-battula]

Hi Kris, whenever you have a moment, I’d love your feedback on this.

[DecodeX15]

can you show a demo ?

[krisstern]

@abhi-battula there is some merge conflict in this PR that needs to be resolved

[abhi-battula]

Hey Kris, yeah, those were from recently merged PRs. I’ve resolved the conflicts, all clean now.

[krisstern]

Hi @abhi-battula there is an additional merge conflict for this PR needs to be resolved

[abhi-battula]

Hey Kris, I’ve resolved that conflict as well. Could you please take a look now when you get a chance? Thanks!

[krisstern]

The light mode looks okay:

But the top wording for the dark mode is too dark in contrast to the background color:

[abhi-battula]

Hi Kris, thanks for pointing that out. I’ll update the dark mode text color to improve the contrast and push a fix shortly.

[abhi-battula]

Hi Kris, I’ve updated the dark mode contrast. Please review it when you have time. Thanks!

[abhi-battula]

Hey Kris, done with the requested changes, please take a look.

[Copilot]

Pull request overview

Implements Phase 2 of #476 by enabling sequential navigation between Contributor Spotlight profile pages using the same published-date ordering as the home page.

Changes:

• Sort allAsciidoc by derived publicationDate when generating contributor pages.
• Pass previous/next contributor metadata via pageContext during page creation.
• Render “Previous Profile” / “Next Profile” navigation UI on the contributor detail template.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
gatsby-node.js	Sorts contributors by publicationDate and wires previous/next data into page context.
src/templates/contributor-details.jsx	Adds bottom-of-page previous/next navigation UI and dark-mode detection for nav label styling.

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[abhi-battula]

Hi Kris, addressed the Copilot suggestion. Please review when you have time. Thanks!