fix(markdown): add support for HTML content (#855)

Signed-off-by: Panos Vagenas <35837085+vagenas@users.noreply.github.com>

tests/data/md/mixed.md

@@ -0,0 +1,54 @@
+# Title
+
+Some text
+
+## Famous ducks
+
+Here is a table:
+
+<table>
+  <tr>
+    <th>Character</th>
+    <th>Name in German</th>
+    <th>Name in French</th>
+    <th>Name in Italian</th>
+  </tr>
+  <tr>
+    <td>Scrooge McDuck</td>
+    <td>Dagobert Duck</td>
+    <td>Balthazar Picsou</td>
+    <td>Paperone</td>
+  </tr>
+  <tr>
+    <td>Huey</td>
+    <td>Tick</td>
+    <td>Riri</td>
+    <td>Qui</td>
+  </tr>
+  <tr>
+    <td>Dewey</td>
+    <td>Trick</td>
+    <td>Fifi</td>
+    <td>Quo</td>
+  </tr>
+  <tr>
+    <td>Louie</td>
+    <td>Track</td>
+    <td>Loulou</td>
+    <td>Qua</td>
+  </tr>
+</table>
+
+And here is more HTML:
+
+<p>Some paragraph.</p>
+
+<div>
+    <p>Now a div — almost there...</p>
+    <ul>
+        <li>foo</li>
+        <li>bar</li>
+    </ul>
+</div>
+
+The end!