Replace hardcoded html with twig templates.

lib/Environment.php

@@ -9,6 +9,7 @@
 use Doctrine\RST\NodeFactory\NodeFactory;
 use Doctrine\RST\References\Reference;
 use Doctrine\RST\References\ResolvedReference;
+use Doctrine\RST\Templates\TemplateRenderer;
 use InvalidArgumentException;
 use function array_shift;
 use function dirname;
@@ -125,6 +126,11 @@ public function getNodeFactory() : NodeFactory
         return $this->configuration->getNodeFactory();
     }
 
+    public function getTemplateRenderer() : TemplateRenderer
+    {
+        return $this->configuration->getTemplateRenderer();
+    }
+
     public function registerReference(Reference $reference) : void
     {
         $this->references[$reference->getName()] = $reference;

lib/Nodes/DocumentNode.php

@@ -11,7 +11,6 @@
 use Exception;
 use function array_unshift;
 use function count;
-use function htmlspecialchars;
 use function is_string;
 use function sprintf;
 
@@ -183,7 +182,7 @@ public function addCss(string $css) : void
         }
 
         $this->addHeaderNode($this->environment->getNodeFactory()->createRawNode(
-            '<link rel="stylesheet" type="text/css" href="' . htmlspecialchars($css) . '" />'
+            $this->environment->getTemplateRenderer()->render('stylesheet-link.html.twig', ['css' => $css])
         ));
     }
 
@@ -196,7 +195,7 @@ public function addJs(string $js) : void
         }
 
         $this->addHeaderNode($this->environment->getNodeFactory()->createRawNode(
-            '<script type="text/javascript" src="' . htmlspecialchars($js) . '"></script>'
+            $this->environment->getTemplateRenderer()->render('javascript.html.twig', ['js' => $js])
         ));
     }
 
@@ -209,7 +208,7 @@ public function addFavicon(string $url = '/favicon.ico') : void
         }
 
         $this->addHeaderNode($this->environment->getNodeFactory()->createRawNode(
-            '<link rel="icon" type="image/x-icon" href="' . htmlspecialchars($url) . '" />'
+            $this->environment->getTemplateRenderer()->render('favicon.html.twig', ['url' => $url])
         ));
     }
 

lib/Templates/default/html/favicon.html.twig

@@ -0,0 +1 @@
+<link rel="icon" type="image/x-icon" href="{{ url }}" />

lib/Templates/default/html/javascript.html.twig

@@ -0,0 +1 @@
+<script type="text/javascript" src="{{ js }}"></script>

lib/Templates/default/html/stylesheet-link.html.twig

@@ -0,0 +1 @@
+<link rel="stylesheet" type="text/css" href="{{ css }}" />