feat: initial app template catalog with 16 apps

Populate the appstore-apptemplates repo with catalog.json and
per-app config files for all 16 curated Docker apps, each at v1.0.0.

apps/ghost/app.json

@@ -0,0 +1,10 @@
+{
+  "id": "ghost",
+  "name": "Ghost",
+  "description": "Professional publishing platform for blogs and newsletters",
+  "category": "CMS",
+  "iconName": "ghost",
+  "latestVersion": "1.0.0",
+  "versions": ["1.0.0"],
+  "maintainer": "serve.zone"
+}

apps/ghost/versions/1.0.0/config.json

@@ -0,0 +1,18 @@
+{
+  "image": "ghost:latest",
+  "port": 2368,
+  "envVars": [
+    {
+      "name": "database__client",
+      "default": "sqlite3"
+    },
+    {
+      "name": "database__connection__filename",
+      "default": "/var/lib/ghost/content/data/ghost.db"
+    },
+    {
+      "name": "url",
+      "default": "http://localhost:2368"
+    }
+  ]
+}