Shift resources into app folder

Add autoloading skeleton and classmap for Page.php / PageController.php

composer.json

@@ -11,9 +11,16 @@
     "require-dev": {
         "phpunit/phpunit": "^5.7"
     },
+    "autoload": {
+        "psr-4": {},
+        "classmap": [
+            "app/src/Page.php",
+            "app/src/PageController.php"
+        ]
+    },
     "extra": {
         "project-files": [
-            "mysite/_config/*",
+            "app/_config/*",
             ".env.example"
         ],
         "public-files": [
@@ -21,8 +28,7 @@
             "favicon.ico"
         ],
         "branch-alias": {
-            "4.x-dev": "4.2.x-dev",
-            "dev-master": "5.x-dev"
+            "4.x-dev": "4.2.x-dev"
         }
     },
     "config": {