Fix broken GitHub link in website navbar

[Obila34]

Description

Fixes#14030.

The GitHub button in the top right of the spacy.io navbar linked to https://github.com/explosion/spaCy/stargazers, which returns a 404 (GitHub no longer serves the public stargazers page).

Root cause: the navbar button in website/src/components/navigation.js is rendered with react-github-btn and data-show-count="true". The underlying github-buttons widget builds the star-count link by appending /stargazers to the repo URL (see the stargazers_count branch in github-buttons' href logic), so the count portion of the widget pointed at the now-removed page.

Change: remove data-show-count="true" so the widget renders a plain GitHub button that links directly to https://github.com/explosion/spaCy.

Verification: confirmed via curl that https://github.com/explosion/spaCy/stargazers returns 404 while https://github.com/explosion/spaCy returns 200; confirmed in github-buttons 2.22.1 (the version pinned in website/package-lock.json) that the /stargazers suffix is only added for the count link when data-show-count is enabled, so removing the attribute leaves a single link to the repository. The server-rendered fallback anchor (href={github()}) already points to the repo and is unchanged.

This is my first contribution, so the PR also adds my signed contributor agreement (.github/contributors/Obila34.md).

Types of change

Bug fix (website).

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[Copilot]

🟢 Approval recommended

The change is minimal, matches the stated root cause, and resolves the broken-link behavior without introducing additional risk.

Pull request overview

This PR fixes a broken GitHub link in the spacy.io website navbar by adjusting the react-github-btn configuration so it no longer generates a star-count link to the deprecated /stargazers URL. It also adds the author’s signed contributor agreement file as required for first-time contributions.

Changes:

• Remove data-show-count="true" from the navbar GitHub button to prevent generation of the /stargazers link.
• Add a signed spaCy contributor agreement under .github/contributors/.

File summaries

File	Description
website/src/components/navigation.js	Disables the GitHub star-count link that was pointing to a 404 by removing data-show-count.
.github/contributors/Obila34.md	Adds the contributor agreement document for the new contributor.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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