docs(readme): restructure README and move detailed content into docs

[lakshay-nasa]

Summary

Restructures the root README into a shorter landing page and moves the detailed sections into the docs site, so nothing from the old README is lost.

README

• New structure: overview, product tour, "Pick your path" (OSS vs Cloud), core capabilities, quick start, integrations, community, license
• The product tour uses the existing GIF for now; an updated GIF will follow
• Fixed the MCP quick start command. npx -y @acryldata/mcp-server-datahub init does not exist on npm; it now uses uvx mcp-server-datahub@latest, matching the MCP server docs
• Consistent integration count (150+), a working license link, and a short requirements line for local quickstart (Docker 8GB RAM, Python 3.10+)
• Docker pulls badge now points to acryldata/datahub-gms
• Copyright notice kept

Where the old README content went

Old section	New location
Company list and case studies	ADOPTERS.md (new)
FAQ (datahub.io, datahubproject.io, LinkedIn origin, install, license)	docs/faq.md (new)
Community channels, town halls, learning resources, important links	docs/community.md (new)
Official repos, community plugins, integrations by category	docs/ecosystem.md (new)
Product tour, screenshots, "Why DataHub", common use cases	docs/features.md
Blog posts, talks, podcast, case studies	docs/links.md
Architecture bullets	docs/architecture/architecture.md
MCP example questions	docs/features/feature-guides/mcp.md
Analytics Agent demo link	docs/features/feature-guides/analytics-agent.md
Snowflake ingestion example (collapsible)	metadata-ingestion/cli-ingestion.md
datahub.io clarification	docs-website/static/llms.txt

Code examples that already have maintained versions in the docs (Python SDK search, GraphQL lineage, adding descriptions) are linked rather than duplicated.

Docs site

• The root README is no longer built into the docs site; /docs/introduction redirects to /docs/features
• FAQ added under "What Is DataHub?"; Community, Ecosystem, and Adopters added under "Community"
• Fixed three links (source-docs-template.md and two Java SDK v2 pages) that only resolved via the root README

Testing

• ./gradlew :datahub-web-react:mdPrettierCheck passes
• ./gradlew :docs-website:yarnLint passes
• ./gradlew :docs-website:yarnBuild passes; verified the new pages render and /docs/introduction redirects

Checklist

• The PR conforms to DataHub's Contributing Guideline (PR Title Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated
• Breaking change entry in Updating DataHub (not applicable)

---

Summary by cubic

Restructures the root README into a short landing page and moves the detailed documentation into the docs site so nothing is lost.

• Adds new docs pages for adopters, FAQ, community, and ecosystem, and moves the product tour, "Why DataHub", use cases, architecture, MCP examples, and Snowflake ingestion examples into existing docs pages.
• The README is no longer built into the docs site; /docs/introduction now redirects to /docs/features.
• Fixes the MCP quickstart command to use uvx mcp-server-datahub@latest instead of the non-existent npx -y @acryldata/mcp-server-datahub init, and fixes three links that only resolved via the old README.

^{Written for commit 38625f8. Summary will update on new commits.}

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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