Add 'self' stack

This commit adds a new stack 'self' that for now just redirects to the
repository.

distillery/resources/compose/web/docker-compose.yml

@@ -3,6 +3,8 @@ version: "3.7"
 services:
   nginx-proxy:
     image: nginxproxy/nginx-proxy:alpine
+    environment:
+      - DEFAULT_HOST=${DEFAULT_HOST}
     ports:
       - "80:80"
       - "443:443"