Update and rename varnish to proxy-frontend

docker/services/proxy-frontend

@@ -1,4 +1,4 @@
-    image: varnish:7.3-alpine
+    image: nginx:stable-alpine
     command: "-p default_keep=300"
     ports:
       - "80:80/tcp"
@@ -6,12 +6,10 @@
       - "443:443/udp"
     sysctls:
       net.ipv4.ip_unprivileged_port_start: 0
-    environment:
-      - VARNISH_SIZE=2G
     tmpfs:
       - "/var/lib/varnish/varnishd:uid=1000,gid=1000"
     volumes:
-      - "/etc/lixonet/${netname}/.config/varnish:/etc/varnish"
+      - "/etc/lixonet/${netname}/.config/proxy-frontend:/etc/nginx"
     depends_on:
       - tinc
     restart: always