Moved pre-commit support to github.com/pre-commit/mirrors-prettier (#8937)

Co-authored-by: fisker Cheung <lionkay@gmail.com>
Co-authored-by: sosukesuzuki <aosukeke@gmail.com>

docs/precommit.md

@@ -61,13 +61,13 @@ Read more at the [pretty-quick](https://github.com/azz/pretty-quick) repo.
 Copy the following config into your `.pre-commit-config.yaml` file:
 
 ```yaml
-- repo: https://github.com/prettier/prettier
+- repo: https://github.com/pre-commit/mirrors-prettier
   rev: "" # Use the sha or tag you want to point at
   hooks:
     - id: prettier
 ```
 
-Read more at the [pre-commit](https://pre-commit.com) website.
+Read more at [mirror of prettier package for pre-commit](https://github.com/pre-commit/mirrors-prettier) and the [pre-commit](https://pre-commit.com) website.
 
 ## Option 4. [git-format-staged](https://github.com/hallettj/git-format-staged)