Online coding classes for beginners 2022 guide

[luojiyin1987]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Closes #627

[luojiyin1987]

#627

[miyaliu666]

目录里面的 id 跳转链接，不知道怎么回事，大小写不一致，基本上都不能跳转，我在发布时修改了。