Rewrite history API guide; delete old example

[wbamberg]

Part of #30131.

mdn/dom-examples#236 added a new demo of the History API to dom-examples, to replace the one at https://developer.mozilla.org/en-US/docs/Web/API/History_API/Example which isn't really usable.

This PR deletes the old example page, and also rewrites the guide page at https://developer.mozilla.org/en-US/docs/Web/API/History_API/Working_with_the_History_API to be built around the new example, as I found the previous page not very helpful or easy to understand.

I hope I've not removed important stuff! As usual I don't know this very well so happy with any kind of feedback.

As a drive-by I also updated https://developer.mozilla.org/en-US/docs/Web/API/History/replaceState to fix an error (the corresponding change for pushState() was #30169).

[github-actions]

Preview URLs

• /en-US/docs/Web/API/History/replaceState
• /en-US/docs/Web/API/History_API/Working_with_the_History_API
• /en-US/docs/Web/Guide/AJAX

External URLs (4)

URL: /en-US/docs/Web/Guide/AJAX
Title: Ajax

• https://www.rfc-editor.org/rfc/rfc9110.html (1 time)
• https://www.semanticscholar.org/paper/Ajax%3A-A-New-Approach-to-Web-Applications-Garrett/c440ae765ff19ddd3deda24a92ac39cef9570f1e?p2df (1 time)
• https://xhr.spec.whatwg.org/ (2 times)

---

URL: /en-US/docs/Web/API/History_API/Working_with_the_History_API
Title: Working with the History API

• https://mdn.github.io/dom-examples/history-api/ (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2023-11-20 19:00:48)

[teoli2003]

A few nit.

[teoli2003]

Approving.