📝(self-hosted) add documentation for self-hosting on docker compose

It describes the minimalist LaSuite Meet instance, with the simple
feature of having a room conference.

docker/files/production/default.conf.template

@@ -0,0 +1,50 @@
+upstream meet_backend {
+    server ${BACKEND_HOST}:8000 fail_timeout=0;
+}
+
+upstream meet_frontend {
+    server ${FRONTEND_HOST}:8080 fail_timeout=0;
+}
+
+server {
+    listen 8083;
+    server_name localhost;
+    charset utf-8;
+
+    # Disables server version feedback on pages and in headers
+    server_tokens off;
+
+    proxy_ssl_server_name on;
+
+    location @proxy_to_meet_backend {
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+        proxy_redirect off;
+        proxy_pass http://meet_backend;
+    }
+
+    location @proxy_to_meet_frontend {
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+        proxy_redirect off;
+        proxy_pass http://meet_frontend;
+    }
+
+    location / {
+        try_files $uri @proxy_to_meet_frontend;
+    }
+
+    location /api {
+        try_files $uri @proxy_to_meet_backend;
+    }
+
+    location /admin {
+        try_files $uri @proxy_to_meet_backend;
+    }
+
+    location /static {
+        try_files $uri @proxy_to_meet_backend;
+    }
+}