docs: Ingress & HTTP overview

website/docs/3-concepts/1-ingress/1-overview.md

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+---
+sidebar_label: Overview
+---
+
+# Ingress & HTTPS
+
+Uncloud uses [Caddy](https://caddyserver.com/) as its reverse proxy to handle incoming traffic, provide automatic HTTPS
+with [Let's Encrypt](https://letsencrypt.org/), and route requests to your services.
+
+## How it works
+
+Caddy runs as a global service `caddy` on every machine in your cluster, listening on the host ports 80 (HTTP) and 443
+(HTTPS).
+
+It's deployed during cluster initialisation (`uc machine init`) unless you use the `--no-caddy` flag.
+See [Managing Caddy](3-managing-caddy.md) for deployment and customisation instructions.
+
+When you [publish a service port](2-publishing-services.md), Uncloud automatically configures Caddy to:
+
+1. Listen for requests on the specified hostname (domain name).
+2. Automatically obtain and renew a TLS certificate from Let's Encrypt for HTTPS.
+3. Route traffic to the **healthy** service container(s).
+4. Load balance across healthy replicas if there are multiple.

website/docs/3-concepts/1-ingress/_category_.yaml

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+label: Ingress & HTTPS
+collapsed: true # keep the category closed by default
+link:
+  type: generated-index

website/docs/3-concepts/_category_.yaml

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+label: Concepts
+collapsed: false # keep the category open by default
+link:
+  type: generated-index