Fix sitemap errors.

robots.txt

@@ -6,4 +6,4 @@ User-agent: *
 {% for node in site.pages %}{% if node.noindex %}{% assign isset = true %}Disallow: {{ node.url }}
 {% endif %}{% endfor %}{% if isset != true %}Disallow:
 {% endif %}
-Sitemap: {{ site.baseurl }}/sitemap.xml
+Sitemap: https://istio.io/sitemap.xml

sitemap.xml

@@ -2,18 +2,21 @@
 title : "Sitemap"
 sitemap_exclude: y
 ---
+
+{% assign istio = "https://istio.io" %}
+
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
     {% for post in site.posts %}
     <url>
-        <loc>{{site.baseurl}}{{ post.url | remove: 'index.html' }}</loc>
+        <loc>{{istio}}{{ post.url | remove: 'index.html' }}</loc>
     </url>
     {% endfor %}
 
     {% for page in site.pages %}
     {% if page.sitemap_exclude != 'y' %}
     <url>
-        <loc>{{site.baseurl}}{{ page.url | remove: 'index.html' }}</loc>
+        <loc>{{istio}}{{ page.url | remove: 'index.html' }}</loc>
     </url>
     {% endif %}
     {% endfor %}
@@ -21,7 +24,7 @@ sitemap_exclude: y
     {% for page in site.docs %}
     {% if page.sitemap_exclude != 'y' %}
     <url>
-        <loc>{{site.baseurl}}{{ page.url | remove: 'index.html' }}</loc>
+        <loc>{{istio}}{{ page.url | remove: 'index.html' }}</loc>
     </url>
     {% endif %}
     {% endfor %}