docs(gremlin): create caddy

Netgrimoire/Services/caddy/caddy.md

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+# caddy Stack
+description: Caddy reverse proxy in NetGrimoire Docker Swarm environment.
+
+---
+## Overview
+Caddy is a secure web server that includes support for HTTPS, HTTP/2, WebSockets, VPNs, DNS, and more. It's designed to be highly configurable and secure. The `caddy` service provides access to the Caddy proxy, while also exposing internal services through reverse proxy.
+
+---
+## Architecture
+| Service | Image | Port | Role |
+|---------|-----|-----|---------|
+- **Host:** docker4
+- **Network:** netgrimoire
+- **Exposed via:** `http://netgrimoire:80`, `https://netgrimoire:443`
+- **Homepage group:** `homepage`