Reviewed #2393, Removed image guessing and added testing

For review of meta tag additions as per PR #2393.
This commit removes any image guesswork and only uses images that have
been set by the author for the specific content.
This also adds tests to cover the expected OG tags.

app/Entities/Tools/PageContent.php

@@ -367,18 +367,4 @@ class PageContent
         $doc->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
         return $doc;
     }
-
-    /**
-     * Retrieve first image in page content and return the source URL.
-     */
-    public function fetchFirstImage()
-    {
-        $htmlContent = $this->page->html;
-
-        $dom = new \DomDocument();
-        $dom->loadHTML($htmlContent);
-        $images = $dom->getElementsByTagName('img');
-
-        return $images->length > 0 ? $images[0]->getAttribute('src') : null;
-    }
 }