Add docker-compose file for simple reverse proxy

Based on caddy-gen
This will start a reverse proxy on port 80 and 443, which proxies
to the plausible container. Note that it will clash with any
existing reverse proxies on the host machine

reverse-proxy/README.md

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+This directory contains pre-made configurations for various reverse proxies. Which flavor you should choose depends on your setup.
+
+## No existing reverse proxy
+
+If you aren't running an existing reverse proxy, then you can use the [`caddy-gen`](https://github.com/wemake-services/caddy-gen) based docker-compose file. Update it to include the domain name you use for your server, then combine it with the existing docker-compose files:
+
+```shell
+$ docker-compose -f docker-compose.yml -f reverse-proxy/docker-compose.caddy-gen.yml up
+```

reverse-proxy/docker-compose.caddy-gen.yml

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+version: "3.3"
+services:
+  caddy-gen:
+    container_name: caddy-gen
+    image: "wemakeservices/caddy-gen:latest"
+    restart: always
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+      - caddy-certificates:/data/caddy
+    ports:
+      - "80:80"
+      - "443:443"
+    depends_on:
+      - plausible
+
+  plausible:
+    ports:
+      - 8000:8000
+    labels:
+      virtual.host: "example.com" # change to your domain name
+      virtual.alias: "www.example.com" # change to any aliases you use (or remove)
+      virtual.port: "8000"
+      virtual.tls-email: "admin@example.com" # change to your email
+        
+volumes:
+    caddy-certificates:
+        driver: local
+