docs: update links (#2006)

docs/guide/configuration.md

@@ -22,6 +22,6 @@ export default {
 
 In the above example, the site will have the title of `VitePress`, and `Just playing around.` as the description meta tag.
 
-Learn everything about VitePress features at [Theme: Introduction](./theme-introduction) to find how to configure specific features within this config file.
+Learn everything about VitePress features at [Theme: Introduction](./customization-intro) to find how to configure specific features within this config file.
 
 You may also find all configuration references at [Config Reference](../config/introduction).

docs/guide/getting-started.md

@@ -136,6 +136,6 @@ To enable those navigations, we must add some configurations to the site. Head t
 
 If you would like to know more about what you can do within the page, for example, writing markdown contents, or using Vue Component, check out the "Writing" section of the docs. [Markdown guide](./markdown) would be a great starting point.
 
-If you want to know how to customize how the site looks (Theme), and find out the features VitePress's default theme provides, visit [Theme: Introduction](./theme-introduction).
+If you want to know how to customize how the site looks (Theme), and find out the features VitePress's default theme provides, visit [Theme: Introduction](./customization-intro).
 
 When your documentation site starts to take shape, be sure to read the [deployment guide](./deploying).

docs/guide/i18n.md

@@ -75,7 +75,7 @@ However, VitePress won't redirect `/` to `/en/` by default. You'll need to confi
 /*  /en/:splat  302
 ```
 
-**Pro tip:** If using the above approach, you can use `nf_lang` cookie to persist user's language choice. A very basic way to do this is register a watcher inside the [setup](./theme-introduction#using-a-custom-theme) function of custom theme:
+**Pro tip:** If using the above approach, you can use `nf_lang` cookie to persist user's language choice. A very basic way to do this is register a watcher inside the [setup](./customization-intro#using-a-custom-theme) function of custom theme:
 
 ```ts
 // docs/.vitepress/theme/index.ts