Delete duplicates the lines 557-569 and 570-582. (#1934)

`## 404 Server Error Page" is duplicated between lines 557-569 and 570-582.
So, lines 570-582 should be deleted.

content/en/getting-started/configuration.md

@@ -567,19 +567,6 @@ Hugo will, by default, render all 404 errors when running `hugo server` with the
     status = 404
 ```
 
-## 404 Server Error Page
-
-{{< new-in "0.103.0" >}}
-
-Hugo will, by default, render all 404 errors when running `hugo server` with the `404.html` template. Note that if you have already added one or more redirects to your [Server Config](#server-config), you need to add the 404 redirect explicitly, e.g:
-
-```toml
-[[redirects]]
-    from   = "/**"
-    to     = "/404.html"
-    status = 404
-```
-
 ## Configure Title Case
 
 Set `titleCaseStyle` to specify the title style used by the [title](/functions/title/) template function and the automatic section titles in Hugo. It defaults to [AP Stylebook](https://www.apstylebook.com/) for title casing, but you can also set it to `Chicago` or `Go` (every word starts with a capital letter).