docs: add *.example.json onboarding files for all three hosts

DeepDrftWeb/authblocks.example.json

@@ -0,0 +1,19 @@
+{
+  "AuthBlocks": {
+    "SupportEmail": "admin@deepdrft.com",
+    "Jwt": {
+      "Secret": "your-jwt-secret-here",
+      "Issuer": "https://deepdrft.com",
+      "Audience": "deepdrft-users"
+    },
+    "Email": {
+      "Host": "smtp.your-provider.com",
+      "Token": "your-email-token-here"
+    },
+    "Admin": {
+      "UserName": "admin",
+      "Email": "admin@deepdrft.com",
+      "Password": "your-admin-password-here"
+    }
+  }
+}