docs: rebuild the introduction as a real front door

[ukimsanov]

What this does

Rebuilds /introduction as the single "What is HyperFrames?" page you can send a stranger, and retires the switchboard that sat in front of it. Stacked on top of the docs refactor branch so this shows only the delta.

Changes

• introduction.mdx — lead with one sentence + a real result that plays with sound (dropped muted); simplify the loop diagram to request → agent → project → video; remove the "See how it works" button that only scrolled the page; replace the equal-weight card-walls with one clear Start here action.
• guides/index.mdx — removed the six-card "What do you need to do?" menu-of-menus. The nav already routes people and /introduction is the real entry point. Added /guides → /introduction redirect.
• developers/index.mdx — repoint the "create a video" link at /quickstart.

Why

Rebuilds the front door around real user journeys (a proposal + interactive prototype were prepared separately for leadership). The old intro asked a cold visitor to triage themselves through six identical cards before seeing any proof; this shows the product first.

Validation

• mint validate ✅
• mint broken-links ✅

Draft — direction pending leadership sign-off on the journeys.

[Copilot]

Pull request overview

Rebuilds the docs /introduction page into a single “front door” overview of HyperFrames, removes the old Guides landing page from navigation, and updates related entry-point links/redirects to steer new users toward the new intro and quickstart.

Changes:

• Reworked docs/introduction.mdx to lead with a concise value statement, a playable (with sound) example video, a simplified “request → agent → project → video” loop, and a clearer “Start here” CTA set.
• Removed the old “What do you need to do?” Guides index page and removed it from the “Start here” nav group.
• Added a /guides → /introduction redirect and repointed the Developers entry link toward /quickstart.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
docs/introduction.mdx	Rewritten “What is HyperFrames?” page with a stronger lead, proof video, simplified loop, and clearer next-step actions.
docs/guides/index.mdx	Removes the Guides landing content (retiring the “menu-of-menus” entry page).
docs/docs.json	Drops guides/index from nav and adds a redirect from /guides to /introduction.
docs/developers/index.mdx	Updates the “create/edit a video” entry link to point to /quickstart instead of /guides.

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