Update kidpix link in README to active url (#4425)

- **PR Description**

I chose a different link than you did Jesse, since this one had a few
more pixels. It's also incredible how _dominant_ Keith Kelly is for
videos of Kid Pix! What compels a man to make a playlist with 16 videos
of various explosion screens!

![image](https://github.com/user-attachments/assets/a7c0acf6-e5e3-472d-86ce-9c983f5ea6d1)



Fixes #4408

- **Please check if the PR fulfills these requirements**

* [ ] Cheatsheets are up-to-date (run `go generate ./...`)
* [ ] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [ ] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [ ] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [ ] If a new UserConfig entry was added, make sure it can be
hot-reloaded (see
[here](https://github.com/jesseduffield/lazygit/blob/master/docs/dev/Codebase_Guide.md#using-userconfig))
* [X] Docs have been updated if necessary
* [X] You've read through your own file changes for silly mistakes etc

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Author: stefanhaller

README.md

@@ -148,7 +148,7 @@ Press `b` in the commits view to mark a commit as good/bad in order to begin a g
 
 ### Nuke the working tree
 
-For when you really want to just get rid of anything that shows up when you run `git status` (and yes that includes dirty submodules) [kidpix style](https://www.youtube.com/watch?v=Ur7_A4JusMU), press `shift+d` to bring up the reset options menu and then select the 'nuke' option.
+For when you really want to just get rid of anything that shows up when you run `git status` (and yes that includes dirty submodules) [kidpix style](https://www.youtube.com/watch?v=N4E2B_k2Bss), press `shift+d` to bring up the reset options menu and then select the 'nuke' option.
 
 ![Nuke working tree](../assets/demo/nuke_working_tree-compressed.gif)