Mushie/new docs

[mush1e]

Description

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Fixes ENG-XXX
Resolves ENG-XXX

Screenshots, Videos (if applicable)

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Additional Notes

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Note

Overhauls documentation structure and content.

• Adds comprehensive Concept docs (e.g., allowlist, asset-scans, blocklist, brands, detections, legal-docs, metrics, organizations, reports, reviews, security-portal, takedowns, watchlist)
• Introduces Getting Started sections: “What we do” and “How it works” (AI, detection sources, scans, review, blocklist, takedown, watchlist)
• Expands Integrations (Discord, Slack, Telegram, Vercel, Intercom, GitHub, Canary Tokens, Webhooks, Zapier) with detailed setup guides
• Adds Guides (API keys, services, allowlist, brands, false positives, public reports, SSO, unflagging, communication) placeholders
• Updates mint.json: new Integrations tab, revamped navigation groups, and numerous redirects from legacy paths to new structure; retitles some integration pages

Scope: Content and navigation changes only; no application logic modified.

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