Align hero CTA buttons

Details

The Scholar/GitHub group (.v3-hero-ctas-secondary) carried a margin-top meant
for the wrapped-to-second-row case, which pushed those two buttons out of
vertical alignment when all four CTAs fit on one line. Removed it; the parent
flex `gap` already spaces the group correctly whether it stays inline (now
aligned) or wraps on narrow screens (verified desktop + mobile).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HShRpQUmDUttxD5F89ziDu

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