chore(docs): collapse some small sections and add a note on MEDIA_LOCATION variable (#9150)

* Update environment-variables.md

* Update config-file.md

* Update config-file.md

* Update command-line-interface.md

* linting

docs/docs/install/config-file.md

@@ -7,6 +7,9 @@ A config file can be provided as an alternative to the UI configuration.
 In JSON format, create a new config file (e.g. `immich.json`) and put it in a location that can be accessed by Immich.
 The default configuration looks like this:
 
+<details>
+<summary>immich.json</summary>
+
 ```json
 {
   "ffmpeg": {
@@ -157,6 +160,8 @@ The default configuration looks like this:
 }
 ```
 
+</details>
+
 :::tip
 In Administration > Settings is a button to copy the current configuration to your clipboard.
 So you can just grab it from there, paste it into a file and you're pretty much good to go.