chore: update docs index with quick start example

docs/index.md

@@ -1,7 +1,66 @@
----
-title: Home
-template: home.html
-hide:
-  - navigation
-  - toc
----
+<div align="center" markdown="0">
+<img src="img/hyperbyte-db.png" alt="HyperbyteDB">
+</div>
+
+# Documentation
+
+HyperbyteDB is a time-series database written in Rust. It speaks the InfluxDB v1 HTTP API, stores data in embedded chDB MergeTree tables, and uses RocksDB for the write-ahead log and metadata. Clustered deployments use Raft for schema consensus and asynchronous replication for writes.
+
+## Quick start
+
+```bash
+docker run -d \
+  --name hyperbytedb \
+  -p 8086:8086 \
+  ghcr.io/hyperbyte-cloud/hyperbytedb:latest
+
+docker exec -it hyperbytedb \
+  hyperbytedb-cli create database mydb
+
+docker exec -it hyperbytedb \
+  hyperbytedb-cli write -database mydb \
+  --data-binary 'cpu,host=srv01 value=42'
+
+  docker exec -it hyperbytedb \
+  hyperbytedb-cli query -database mydb \
+  --data-urlencode 'q=SELECT * FROM cpu'
+```
+
+## User guide
+
+For operators and application developers deploying HyperbyteDB.
+
+| Topic | Description |
+|-------|-------------|
+| [Installation](user-guide/installation.md) | Docker, Compose, binaries, kind, Kubernetes operator |
+| [Configuration](user-guide/configuration.md) | `config.toml` and `HYPERBYTEDB__*` environment variables |
+| [Basic operations](user-guide/basic-operations.md) | Databases, writes, queries, retention |
+| [Authentication](user-guide/authentication.md) | Credentials, public routes, admin APIs |
+| [Advanced features](user-guide/advanced-features.md) | Clustering, continuous queries, TLS, tracing |
+| [Common workflows](user-guide/common-workflows.md) | InfluxDB migration, Telegraf, Grafana, monitoring |
+| [Administration](user-guide/administration.md) | Metrics, logs, traces, backup, cluster ops |
+| [Troubleshooting](user-guide/troubleshooting.md) | Common problems |
+| [API reference](user-guide/reference.md) | HTTP endpoints and TimeseriesQL compatibility |
+| [Kubernetes operator](user-guide/operator/index.md) | Helm install, CRDs, backups |
+
+Start with the [user guide index](user-guide/index.md) for a recommended reading order.
+
+## Developer guide
+
+For contributors working on the codebase.
+
+| Topic | Description |
+|-------|-------------|
+| [Architecture](developer-guide/architecture.md) | Hexagonal design and data flow |
+| [Development setup](developer-guide/development-setup.md) | Build, run, and debug locally |
+| [Testing](developer-guide/testing.md) | Test suites and CI |
+| [Contributing](developer-guide/contributing.md) | PR process and review checklist |
+
+See the [developer guide index](developer-guide/index.md) for internals and deep dives.
+
+## Other references
+
+- [Glossary](glossary.md) — shared terminology
+- [Benchmarks](benchmarks.md) — Criterion ingestion benchmarks
+- [Deep dives](deep-dive/README.md) — write path, read path, clustering, compaction
+- **Container image:** `ghcr.io/hyperbyte-cloud/hyperbytedb:latest`