changed PageContent.php to accept nested includes (#4192)

* changed app/Entities/Tools/PageContent.php to accept nested include levels. Tested it and it works.

* changed recommendations

This loop is now only around parsePageIncludes and bugfixes the space indentation.

* Update PageContent.php

fix spaces

app/Entities/Tools/PageContent.php

@@ -303,8 +303,10 @@ public function render(bool $blankIncludes = false): string
 
         if ($blankIncludes) {
             $content = $this->blankPageIncludes($content);
-        } else {
-            $content = $this->parsePageIncludes($content);
+            } else {
+                for ($includeDepth = 0; $includeDepth <= 3; $includeDepth++) {
+                    $content = $this->parsePageIncludes($content);
+                }
         }
 
         return $content;