Add support to add a blog using Ghost, creating a separated blog page

config.json

@@ -9,6 +9,11 @@
         "WhiteLabel": "true",
         "FooterVersion": "true"
     },
+    "Ghost": {
+        "Enabled": true,
+        "Instance": "https://minpluto.ghost.sudovanilla.org",
+        "Key": "22f4a31cd6f8cc0b2a2718a0cd"
+    },
     "FeelbackConfig": {
         "Enabled": false,
         "ContentSetId": "566e8b96-c65e-4bf7-87df-d22a9f4994a2",
@@ -17,6 +22,10 @@
         "Answer": "Thank you for your feedback."
     },
     "HeaderItems": [
+        {
+            "text": "Blog",
+            "link": "/blog/"
+        },
         {
             "text": "Syntax",
             "link": "/syntax/"