fix: add rel='noopener noreferrer' to external links

[Pranav-IIITM]

Summary

All external links using target="_blank" across the site's partials were missing the rel="noopener noreferrer" attribute, exposing the site to reverse tabnapping attacks and minor performance issues. This PR fixes all affected files.

Closes #726

Changes Made

Added rel="noopener noreferrer" to all target="_blank" links in the following files:

• layouts/partials/social-buttons.html — GitHub, Twitter, Slack links
• layouts/partials/navbar.html — External top menu links
• layouts/partials/home/hero.html — Download releases button
• layouts/partials/home/project.html — Community link
• layouts/partials/footer.html — GitHub, Status Page, Logos, Slack, Twitter, CC-BY-4.0 License, The Linux Foundation, Trademark Usage links
• layouts/partials/docs/sidebar.html — GitHub source & issues links
• layouts/partials/cli-docs/sidebar.html — GitHub source & issues links
• layouts/partials/blog/posts.html — External blog links

Before & After

Before

<a href="https://example.com" target="_blank">Link</a>

After

<a href="https://example.com" target="_blank" rel="noopener noreferrer">Link</a>

Why It Matters

• Security — Prevents reverse tabnapping attacks where a newly opened tab could access window.opener and redirect the original page to a malicious URL
• Privacy — noreferrer stops the browser from sending the Referer header, preventing the origin URL from leaking to external sites
• Performance — noopener ensures the new tab runs in a separate process, improving performance in some browsers

References

• MDN Web Docs — Link types: noopener
• web.dev — Links to cross-origin destinations are unsafe

Checklist

• All target="_blank" links now include rel="noopener noreferrer"
• No existing functionality or styling affected
• Changes verified across all affected partials

[Pranav-IIITM]

@zyyw @OrlinVasilev @AllForNothing Please review the PR !!