Add missing HTML standard files

_includes/header.liquid

@@ -6,7 +6,7 @@
 			<figcaption>{{ site.title }}</figcaption>
 		</div>
 	</a>
-	<a id="navigation-toggle">≡</a>
+	<a href="#" id="navigation-toggle">≡</a>
 	<nav id="navigation" class="navigation" role="navigation">
 {% include navigation.liquid data=site.data.navigation %}
 	</nav>

_includes/page_start.liquid

@@ -23,10 +23,10 @@
 		<meta property="og:site_name" content="{{ site.title }}" />
 		<meta property="og:title" content="{{ page.title | default: site.title | strip_html }}" />
 {% if site.xaymar.opengraph.excerpt.enabled == true %}
-		<meta property="description" content="{{ page.excerpt | default: site.description | strip_html | normalize_whitespace | truncatewords: site.xaymar.opengraph.excerpt.length }}" />
+		<meta name="description" content="{{ page.excerpt | default: site.description | strip_html | normalize_whitespace | truncatewords: site.xaymar.opengraph.excerpt.length }}" />
 		<meta property="og:description" content="{{ page.excerpt | default: site.description | strip_html | normalize_whitespace | truncatewords: site.xaymar.opengraph.excerpt.length }}" />
 {% else %}
-		<meta property="description" content="{{ site.description | strip_html }}" />
+		<meta name="description" content="{{ site.description | strip_html }}" />
 		<meta property="og:description" content="{{ site.description | strip_html }}" />
 {% endif %}
 		<meta property="og:type" content="{{ page.opengraph.type | default: "website" }}" />

robots.txt

@@ -0,0 +1,7 @@
+User-agent: *
+Disallow: /assets/
+Disallow: /feed/
+Disallow: /feed.xml
+Disallow: /restricted/
+Disallow: /404.html
+Disallow: /redirects.json