Mitigate #171 by using js front matter type instead of YAML.

content/index.njk

@@ -1,8 +1,10 @@
----
-eleventyNavigation:
-  key: Home
-  order: 1
-numberOfLatestPostsToShow: 3
+---js
+const eleventyNavigation = {
+	key: "Home",
+	order: 1
+};
+
+const numberOfLatestPostsToShow = 3;
 ---
 {% set postsCount = collections.posts | length %}
 {% set latestPostsCount = postsCount | min(numberOfLatestPostsToShow) %}