Add the ability to put an information message at the top of a confluence page

docs/05_Configuration/Confluence_upload.md

@@ -68,3 +68,21 @@ By default, it will inform you that some pages aren't needed anymore and you can
 ```
 
 By setting `delete` to `true` (or running `daux.phar` with the `--delete` flag) you tell the generator that it can safely delete the pages.
+
+
+## Information message
+When you create your page. there is no indication that the upload process will override the content of the pages.
+
+It happens sometimes that users edit the pages to add / fix an information.
+
+You can add a text in a "information" macro on top of the document by setting the following configuration :
+
+```json
+{
+	"confluence": { "header": "These pages are updated automatically, your changes will be overriden." }
+}
+```
+
+It will look like this :
+
+![Info macro](info_macro.png)

libs/Format/Confluence/ContentPage.php

@@ -27,7 +27,13 @@ class ContentPage extends \Todaymade\Daux\Format\Base\ContentPage
                 }
             );
 
-        return $content;
+
+        $intro = '';
+        if (array_key_exists('confluence', $this->params) && array_key_exists('header', $this->params['confluence']) && !empty($this->params['confluence']['header'])) {
+            $intro = '<ac:structured-macro ac:name="info"><ac:rich-text-body>' . $this->params['confluence']['header'] . '</ac:rich-text-body></ac:structured-macro>';
+        }
+
+        return $intro . $content;
     }
 
     private function createImageTag($filename, $attributes)