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

DeepDrftCli/connections.example.json

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+{
+  "CliSettings": {
+    "ConnectionString": "Host=localhost;Port=5433;Database=postgres;Username=postgres;Password=your-password-here",
+    "VaultPath": "C:/Development/DeepDrftHome/Database/Vaults"
+  }
+}

DeepDrftContent/apikey.example.json

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+{
+  "ApiKeySettings": {
+    "ApiKey": "your-secret-api-key-here"
+  }
+}

DeepDrftContent/filedatabase.example.json

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+{
+  "FileDatabaseSettings": {
+    "VaultPath": "C:/Development/DeepDrftHome/Database/Vaults"
+  }
+}

DeepDrftWeb/apikey.example.json

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+{
+  "DeepDrftContent": {
+    "ApiKey": "your-secret-api-key-here"
+  }
+}

DeepDrftWeb/authblocks.example.json

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+{
+  "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"
+    }
+  }
+}

DeepDrftWeb/connections.example.json

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+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Port=5433;Database=postgres;Username=postgres;Password=your-password-here",
+    "Auth": "Host=localhost;Port=5433;Database=postgres;Username=postgres;Password=your-password-here"
+  }
+}