915: add expandable code blocks; windows-service-installation

Author: Nadia-JSch

docs/getstarted/installation/windows-service-installation.mdx

@@ -42,14 +42,17 @@ There are multiple ways to install and start the service. For your convenience,
 
   For example:
 
-  ```json
+<details>
+  <summary>Click to expand the code block</summary>
+  ```js
   {
     "executablePath": "c:\\Program Files\\Device42\\d42_winagent.exe",
     "WorkingDir": "c:\\ProgramData\\Device42",
     "arguments": ["-host=https://10.92.11.63","-skip-software=true"],
     "interval": 2
   }
   ```
+</details>
 
 :::note
 Each of the `"arguments"` is enclosed in double quotes.