various fixes for the blog including prismjs highlighting, colour schemes and embedding media

Signed-off-by: rodude123 <rodude123@gmail.com>

dist/api/blog/blogData.php

@@ -674,6 +674,7 @@ EOD;
     public function changeHTMLSrc(string $body, string $to, string $from): string
     {
         $htmlDoc = new DOMDocument();
+        $body = mb_convert_encoding($body, "HTML-ENTITIES", "UTF-8");
         $htmlDoc->loadHTML($body, LIBXML_NOERROR);
         $doc = $htmlDoc->getElementsByTagName('body')->item(0);
         $imgs = $doc->getElementsByTagName('img');
@@ -708,7 +709,8 @@ EOD;
         $newBody = '';
         foreach ($doc->childNodes as $node)
         {
-            $newBody .= $htmlDoc->saveHTML($node);
+            $newHTML = $htmlDoc->saveHTML($node);
+            $newBody .= mb_convert_encoding($newHTML, "UTF-8", mb_detect_encoding($newHTML));
         }
         return $newBody;
     }