docs: comprehensive documentation overhaul, deployment routing, and navigation improvements

[blue4209211]

Summary of Documentation Overhaul

This PR comprehensively addresses feedback from the installation assessment, section-by-section engineering review, and navigation refinements:

Key Enhancements

1. Choose Your Deployment Model Router: Rebuilt /docs/installation/ with a SaaS vs. Self-Hosted decision matrix and Kubernetes infrastructure scope clarity.
2. Server Installation Clarity:
   • Added Components & Why They Exist reference table (PostgreSQL and RabbitMQ as required hard dependencies; Redis optional in-memory fallback; Qdrant/Temporal conditional).
   • Added license and auth key security blast radius callout.
   • Added architectural rationales for network egress, Ingress/SSL, and external databases.
   • Added positive-path verification checklists ("What success looks like").
   • Reclassified default JWT and encryption keys as mandatory to override in production with openssl generation commands.
3. Agent Installation: Added environment tabs (AWS EKS, GCP GKE, Azure AKS, Local Kind/Minikube), verification steps, and error troubleshooting.
4. Welcome / Landing Page: Added 2-card "Fork in the Road" setup paths and Core Concepts & Glossary box.
5. AI & Troubleshooting: Documented NuBi Knowledge Graph reasoning, human-in-the-loop guardrails, and sample CrashLoopBackOff incident walkthrough.
6. FinOps & Optimizations: Added Right-Sizing calculation mechanics table and GitOps PR workflow.
7. Workflow Builder: Added variable cheatsheet ({{ steps.<id>.output }}) and 3 production cookbook blueprints.
8. Integrations: Added least-privilege AWS IAM Policy JSON and BYOM Helm snippets for Ollama, vLLM, Bedrock, and OpenAI.
9. Security & Telemetry: Added Zero-Telemetry data isolation architecture diagram and Agent read-only Kubernetes ClusterRole RBAC reference.
10. Dedicated Releases Menu & Navigation Flow:
    • Moved release notes out of nested install paths to a dedicated top-level Releases sidebar menu.
    • Split into Server Releases (GA v1.x root + collapsed pre-1.0 archive), K8s Agent Releases, and Proxy Agent Releases.
    • Positioned FAQ cleanly as the final section in the sidebar.

Verification

• Tested with npm run build inside doc-server: 0 errors, 0 broken links, 0 broken anchors.

[gemini-code-assist]

Code Review

This pull request significantly enhances and restructures the NudgeBee documentation, adding detailed guides on system requirements, data isolation architecture, agent RBAC permissions, GitOps workflows, and troubleshooting. The review feedback is highly constructive and should be fully addressed: it recommends replacing non-standard LaTeX math syntax ($\rightarrow$) with standard unicode arrows (→) across several files to ensure consistent rendering in Docusaurus, adding a missing Prometheus installation step to the GCP GKE setup tab, and clarifying the usage of bare model IDs for AWS Bedrock on-demand inference.