Updated docker-compose files for use with Docker Caddy

Defined top level name for all services
Added proxy-net to services
Updated main service/server container service name to "app"
Updated hostname references to projectname-app-1
Updated docker Caddy caddyfile to reference container names
Updated docker Caddy caddyfile to use 192.168.1.234 instead of localhost for non-docker services
Adjusted caddyfile accordingly

actual-server/docker-compose.yml

@@ -1,6 +1,9 @@
+name: actual-server
 services:
-  actual_server:
+  app:
     image: docker.io/actualbudget/actual-server:latest
+    networks:
+      - proxy-net
     ports:
       # This line makes Actual available at port 5006 of the device you run the server on,
       # i.e. http://localhost:5006. You can change the first number to change the port, if you want.
@@ -21,3 +24,7 @@ services:
       # '/data' is the path Actual will look for its files in by default, so leave that as-is.
       - ./data:/data
     restart: unless-stopped
+
+networks:
+  proxy-net:
+    external: true