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

stashapp/docker-compose.yml

@@ -1,11 +1,13 @@
 # APPNICENAME=Stash
 # APPDESCRIPTION=An organizer for your porn, written in Go
+name: stashapp
 services:
-  stash:
+  app:
     image: stashapp/stash:latest
-    container_name: stash
     restart: unless-stopped
     ## the container's port must be the same with the STASH_PORT in the environment section
+    networks:
+      - proxy-net
     ports:
       - "9999:9999"
     ## If you intend to use stash's DLNA functionality uncomment the below network mode and comment out the above ports section
@@ -49,3 +51,7 @@ services:
       - ./data/db:/db
       ## Where to store generated content (screenshots,previews,transcodes,sprites)
       - /media/stashapp/generated:/generated
+
+networks:
+  proxy-net:
+    external: true