Add substack Detection

src/technologies/s.json

@@ -4898,6 +4898,17 @@
     },
     "website": "http://subrion.com"
   },
+  "substack": {
+    "cats": [
+      11
+    ],
+    "headers": {
+      "x-cluster": "substack",
+      "x-served-by": "Substack"
+    },
+    "icon": "substack.png",
+    "website": "http://substack.com/"
+  },
   "Sucuri": {
     "cats": [
       31,
@@ -5542,4 +5553,4 @@
     },
     "website": "https://styled-components.com"
   }
-}
+}