Config File Directories Content

When I try to run scenes using

```
manimgl _2022/wordle.py
```

I'm getting an error ending in
```
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/manimlib/utils/file_ops.py", line 47, in find_file
raise IOError(f"{file_name} not Found")
OSError: /Users/grant/Dropbox/3Blue1Brown/images/pi_creature/svg/plain.svg not Found
```

I understand that I need to change these lines in `custom_config.yml` to point to local content:
```yml
directories:
mirror_module_path: True
output: "/Users/grant/Dropbox/3Blue1Brown/videos"
raster_images: "/Users/grant/Dropbox/3Blue1Brown/images/raster"
vector_images: "/Users/grant/Dropbox/3Blue1Brown/images/vector"
pi_creature_images: "/Users/grant/Dropbox/3Blue1Brown/images/pi_creature/svg"
sounds: "/Users/grant/Dropbox/3Blue1Brown/sounds"
data: "/Users/grant/Dropbox/3Blue1Brown/data"
temporary_storage: "/Users/grant/Dropbox/3Blue1Brown/manim_cache"
```

But my question is, point them to what exactly? I can see that other people are able to run `wordle.py` but I have no idea where they got functional content to put in local versions of these directories.

该 issue 指向 custom_config.yml 和发生错误的 file_ops.py 模块。查看默认配置或示例配置，了解应包含哪些目录。检查仓库中是否有示例 assets 或获取它们的说明。目标是更新文档，说明为运行 scenes 获取或创建必要的图片和声音文件的位置。

由索引模型根据 Issue 内容生成。