pages for migration instruction are missing

[TheRealBlackNet]

Your Redot version:
26.1

Issue description:
The button "see migration instruction" in the project manager opens a brower to "en/latest/tutorials/migrating/index.html" but this page does not exists.

URL to the documentation page:
https://docs.redotengine.org/en/latest/tutorials/migrating/index.html
-> Page not found

see godot:
https://docs.godotengine.org/en/latest/tutorials/migrating/index.html