Change default config to use pathPrefix: "/" and then use --pathprefix="/eleventy-base-blog/ for GitHub deploy command. Requires Eleventy v0.2.11

index.njk

@@ -5,7 +5,11 @@ navtitle: Home
 ---
 
 <div class="warning">
-	Now edit the <code>_data/metadata.json</code> with your blog’s information—and delete this message from <code>index.njk</code>.
+	<ol>
+		<li>Edit the <code>_data/metadata.json</code> with your blog’s information.</li>
+		<li>(Optional) Edit <code>.eleventy.js</code> with your configuration preferences.</li>
+		<li>Delete this message from <code>index.njk</code>.</li>
+	</ol>
 </div>
 
 {% set postslist = collections.posts %}