docs: rewrite root README to enterprise-grade structure

[weroperking]

Motivation

• Replace the fragmented, community-oriented README with a concise, enterprise-grade landing document that clearly communicates product positioning, governance expectations, and practical onboarding for platform and product engineering teams.
• Improve navigation to core docs and make deployment and operating guidance prominent for self-hosted and production adoption.

Description

• Rewrote the root README.md end-to-end to introduce an Executive Summary, Who Betterbase Is For, Core Capabilities, Architecture at a Glance, Quick Start (IaC Workflow), Enterprise Operating Model, Documentation Map, Deployment Modes, Repository Structure, and a streamlined Development and Contribution section.
• Removed large ASCII-art header and consolidated Deepwiki-specific badge/content into a compact header linking to docs, self-hosting, contributing, and notice files.
• Added succinct sample IaC schema and typical project layout examples, and replaced scattered feature tables with a focused capabilities and deployment narrative.
• Updated internal links to existing docs (e.g., docs/README.md, SELF_HOSTED.md, CONTRIBUTING.md, NOTICE.md) and kept developer commands (bb init, bb dev, bun install) for quick onboarding.

Testing

• Verified the file diff and staged/committed the change using git add README.md and git commit, which succeeded.
• Attempted to run linting via bun run lint, which failed in the current environment with turbo: command not found (dependencies not installed), so automated lint/test suite could not be executed here.
• Performed local file inspections (viewing the new README.md) to confirm formatting and link references.

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Codex Task

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Run ID: 38754a77-b017-401c-bafd-7c534ca6c6bd

📥 Commits

Reviewing files that changed from the base of the PR and between de23ac3 and 44fa6cf.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/rewrite-readme-for-comprehensive-enterprise-style

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