Update hook links to use relative paths for better documentation navigation

Author: jexjws

cookbook/setup.md

@@ -32,7 +32,7 @@ Because you can append a list of paths, you can append multiple at once. You can
 $env.PATH ++= [ '~/.local/bin', ($env.CARGO_HOME | path join "bin") ]
 ```
 
-Because PATH order makes a difference, you may want to *prepend* your paths instead, so that they take precedence over other executables with the same name:
+Because PATH order makes a difference, you may want to _prepend_ your paths instead, so that they take precedence over other executables with the same name:
 
 ```
 use std/util "path add"
@@ -84,6 +84,7 @@ You should now be able to run `config nu` or `config env` and edit those files e
 ```nu
 $env.APPDATA
 ```
+
 ---
 
 ### Use hooks to export state via environment variables
@@ -95,7 +96,7 @@ To be most compatible, the `starship` binary will run every prompt render and
 is absolute stateless.
 Nushell, however, is very stateful in a single instance.
 
-[Hooks](https://www.nushell.sh/book/hooks.html#hooks) allow registration of
+[Hooks](../book/hooks) allow registration of
 custom callback functions.
 In this case, the `pre_prompt` hook is very useful.
 With it, we can export state information as an environment variable, for

zh-CN/cookbook/setup.md

@@ -95,7 +95,7 @@ $env.APPDATA
 并且是绝对无状态的。
 然而，Nushell 在单个实例中是非常有状态的。
 
-[钩子](https://www.nushell.sh/book/hooks.html#hooks) 允许注册自定义回调函数。
+[钩子](../book/hooks) 允许注册自定义回调函数。
 在这种情况下，`pre_prompt` 钩子非常有用。
 有了它，我们可以将状态信息导出为环境变量，例如，当前激活了哪些 [覆层](https://www.nushell.sh/book/overlays.html)。