Add comprehensive documentation for CLICD features and operations

- Introduced Container Management documentation covering lifecycle operations, resource management, and console access.
- Added Dashboard documentation detailing metrics and related APIs.
- Created Host Report documentation summarizing host environment and resource status.
- Included Image Management documentation for template handling and management actions.
- Documented Networking and Routing features including NAT4 and IPv6 management.
- Added Security Alerts documentation outlining alert scenarios and API usage.
- Created Snapshot Management documentation for snapshot operations and scheduling.
- Documented Sub-user management for granting access to specific containers.
- Added Configuration guide detailing runtime settings and security recommendations.
- Created Installation guide for setting up CLICD with requirements and steps.
- Added Introduction and Quick Start guides for new users.
- Documented Upgrade process with version checking and pre-upgrade checklist.
- Created Deployment guide for service exposure and firewall recommendations.
- Added FAQ section addressing common questions and concerns.
- Documented Troubleshooting steps for common issues encountered.

docs/en/index.md

@@ -0,0 +1,23 @@
+---
+layout: home
+
+hero:
+  name: CLICD
+  text: Lightweight LXC/KVM Virtualization Panel
+  tagline: Web console, CLI, container orchestration, NAT/IPv4/IPv6 routing, snapshots, security alerts, sub-users, and API automation.
+  actions:
+    - theme: brand
+      text: Install
+      link: /en/guide/installation
+    - theme: alt
+      text: API Reference
+      link: /en/features/api
+
+features:
+  - title: Built for Small Hosts
+    details: Manage LXC containers and KVM virtual machines on a single VPS or dedicated server.
+  - title: Web and CLI Together
+    details: Use the web panel for daily operations, or drop into the clicd CLI for maintenance tasks.
+  - title: Automation Friendly
+    details: /api/v1 exposes containers, images, snapshots, security, logs, sub-users, and API key management.
+---