doc: restructure docs site — flatten layout, default light theme, add introduction

- Remove nested docs/ section to eliminate double /docs/docs/ URLs
- Move all content to root level with cascade type: docs
- Add proper introduction page as site root
- Default to light theme, remove navbar theme toggle
- Sidebar sections expanded by default
- Remove edit-on-GitHub links
- Change baseURL from /docs/ to / for simpler reverse proxy setup

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: hyacinthus

docs/content/en/_index.md

@@ -1,6 +1,37 @@
 ---
-title: "IntentKit"
-linkTitle: "IntentKit"
+title: "Introduction"
+cascade:
+  type: docs
+  sidebar:
+    open: true
 ---
 
-IntentKit is an agent system and runtime for building, managing, and integrating autonomous agents.
+IntentKit is an open-source, self-hosted cloud agent cluster that manages a collaborative team of AI agents. Unlike local-first agent frameworks that demand expensive hardware and broad system permissions, IntentKit takes a cloud-native approach — lightweight, always-on, and production-ready out of the box.
+
+## What IntentKit Does
+
+IntentKit lets you create, configure, and run multiple AI agents that work together as a team. Each agent can:
+
+- Interact with users through social platforms such as Twitter and Telegram
+- Execute tasks autonomously on a schedule
+- Call other agents for collaboration
+- Use an extensible skill system to perform actions — from web searches to on-chain transactions
+
+All of this runs as a set of standard containerized services (API server, autonomous runner, and scheduler) backed by PostgreSQL, Redis, and S3-compatible storage.
+
+## Key Features
+
+- **Cloud-Native** — Designed for container orchestration. Runs efficiently with minimal resources.
+- **Collaborative Agents** — Agents can invoke each other, enabling multi-agent workflows.
+- **Extensible Skill System** — Add new capabilities by writing skill plugins without modifying the core.
+- **Platform Integrations** — Built-in support for Twitter, Telegram, and more.
+- **Crypto-Friendly** — Optional Web3 and blockchain integrations for on-chain operations.
+- **API-First** — Every agent exposes its own API for external integration.
+
+## About This Documentation
+
+This documentation covers how to deploy and use IntentKit. You will find:
+
+- **Deployment** — Step-by-step guides for running IntentKit with Docker Compose (development) or Docker Swarm (production).
+- **Usage** — How to create agents, configure skills, and interact with the system.
+- **Others** — Architecture details, API reference, LLM configuration, and contribution guidelines.