Shift public resources into public folder

.gitignore

@@ -2,4 +2,5 @@
 /.env
 /vendor/
 /themes/simple/
-/resources/
+/resources/
+/public/resources/

.htaccess

@@ -0,0 +1,2 @@
+RewriteEngine On
+RewriteRule .* public/%1

composer.json

@@ -13,9 +13,11 @@
     },
     "extra": {
         "project-files": [
-            "assets/*",
             "mysite/_config/*",
-            ".env.example",
+            ".env.example"
+        ],
+        "public-files": [
+            "assets/*",
             "favicon.ico"
         ],
         "branch-alias": {
@@ -28,4 +30,4 @@
     },
     "prefer-stable": true,
     "minimum-stability": "dev"
-}
+}

mysite/_config/theme.yml

@@ -3,5 +3,6 @@ Name: mytheme
 ---
 SilverStripe\View\SSViewer:
   themes:
+    - '$public'
     - 'simple'
     - '$default'