Doc site homepage: fix small screen clipping issue

[mknadler]

Fixes for two interrelated visual issues effecting the homepage on small screens (e.g. smaller phones):

1. The framework installation tabs can't be interacted with if offscreen; I added scrolling.
2. The entire hero section was getting clipped offscreen below about 450px or so.

Before:

After:

[changeset-bot]

⚠️ No Changeset found

Latest commit: 544a4f2

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[pullfrog]

✅ No new issues found.

Reviewed changes — small-screen CSS fixes for the doc site's homepage hero and framework-install tabs.

• Add overflow-x: auto to .tabsHeader — lets the framework installation tabs scroll horizontally when they don't fit the viewport.
• Cap .heroDemo width at calc(100vw - 50px) under max-width: 480px — prevents the 400px-wide install demo from overflowing and clipping the hero on narrow phones.

  ^{｜ View workflow run ｜ Using Kimi K2 (free via Pullfrog for OSS) ｜ 𝕏}

[spaansba]

thank you!