remove unnecessary files

app.json

@@ -1,43 +0,0 @@
-{
-  "name": "growi",
-  "description": "Team collaboration system with markdown",
-  "keywords": [
-    "wiki",
-    "communication"
-  ],
-  "repository": "https://github.com/weseek/growi",
-  "success_url": "/",
-  "env": {
-    "NODE_ENV": {
-      "description": "DO NOT CHANGE - 'yarn' needs this to install devDependencies",
-      "value": "development"
-    },
-    "FILE_UPLOAD": {
-      "description": "Attached files storage. - mongodb | aws | local | none",
-      "value": "mongodb",
-      "required": false
-    },
-    "SECRET_TOKEN": {
-      "description": "A secret key for verifying the integrity of signed cookies.",
-      "generator": "secret"
-    },
-    "PASSWORD_SEED": {
-      "description": "A password seed is used by password hash generator. ",
-      "generator": "secret"
-    },
-    "ADDITIONAL_PACKAGES": {
-      "description": "Space-separated list of npm package names to install.",
-      "value": "growi-plugin-lsx growi-plugin-pukiwiki-like-linker growi-plugin-attachment-refs react-images@1.0.0 react-motion",
-      "required": false
-    }
-  },
-  "addons": [
-    "mongolab",
-    {
-      "plan": "searchbox:starter",
-      "options": {
-        "es_version": "6"
-      }
-    }
-  ]
-}