Update home page button font-weight to 500

[devin-ai-integration]

Update home page button font-weight from 400 to 500

Summary

Updates the font-weight on all home page buttons (.a-btn class) from 400 to 500. This affects every button across the landing page including the SDKs, Docs, Ask Fern, Community, and Help sections.

The GT-Planar Medium font (GT-Planar-Medium.woff2) is already loaded at weight 500, so these buttons will now render using the medium weight variant.

Review & Testing Checklist for Human

• Visually verify the home page buttons at buildwithfern.com/learn (or preview deployment) — confirm the medium weight looks correct across all button groups (filled, minimal, and outlined variants)
• Spot-check on mobile viewport to ensure the heavier weight doesn't cause text overflow or layout issues in the button rows

Notes

Requested by: Fern Support
Link to Devin run

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[devin-ai-integration]

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[dsinghvi]

Requested by: Fern Support
Slack thread: View conversation

[github-actions]

🌿 Preview your docs: https://fern-preview-26004371-a997-48eb-8050-a4458a7e2197.docs.buildwithfern.com/learn

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.