chore: small wiki visual changes

wiki/index.php

@@ -15,7 +15,6 @@ $Extra = new ParsedownExtra();
 </div>
 
 <article id="content">
-<p>Artykuły na naszej wiki:</p>
 
 <?php
 
@@ -39,7 +38,7 @@ foreach (glob("source/*.md") as $file)
 
 foreach ($categories as $category) 
 {
-  echo '<b> > '.ucwords($category).'</b>';
+  echo '<h3> > '.ucwords($category).'</h3>';
   echo '<ul>';
 
   $article_titles = [];