Attempt at caddyfile/proxy, simplification

The idea of proxying in front of Garage may be warranted, to handle some
of the ways that it subdomains further. However, I'm not there yet.

CloudronManifest.json

@@ -5,18 +5,20 @@
   "healthCheckPath": "/health",
   "multiDomain": true,
   "httpPort": 3900,
-  "httpPorts": {
+  "tcpPorts": {
     "GARAGE_WEB": {
-      "title": "Garage web server domain",
-      "description": "Buckets as static sites can be found here",
-      "containerPort": 3902,
-      "defaultValue": "web"
+        "title": "Garage web server domain",
+        "description": "Web port",
+        "defaultValue": 3902,
+        "containerPort": 3902,
+        "portCount": 1
     },
-    "GARAGE_ADMIN": {
-      "title": "Garage Admin API Domain",
-      "description": "For administering the Garage instance remotely",
-      "containerPort": 3903,
-      "defaultValue": "admin"
+      "GARAGE_ADMIN": {
+        "title": "Admin port",
+        "description": "Admin port",
+        "defaultValue": 3903,
+        "containerPort": 3903,
+        "portCount": 1
     }
   },
   "addons": {