more brand renames; add ghost as blog

src/_data/menu.js

@@ -129,7 +129,7 @@ module.exports = [
       {
         "name": "Blog",
         "slug": "blog",
-        "url": site.media.blog,
+        "url": site.media.ghost,
         "target": "_blank",
         "order": 3,
         "class": ""

src/_data/site.js

@@ -49,6 +49,7 @@ module.exports = {
     telegram: 'https://t.me/start9_labs',
     youtube: 'https://www.youtube.com/channel/UCGEw4HJDvOn3Oy8ykR36P7Q',
     discourse: 'https://community.start9.com',
-    blog: 'https://blog.start9.com',
-  }
+    medium: 'https://start9labs.medium.com',
+    ghost: 'https://blog.start9.com',
+  },
 };