Invalid path/route leads to a broken page
Description:
Any invalid URL/route on the handbook site leads to a broken page, which doesn't load the 404 page or provides any information to the users.
Observed behavior:
The URL https://handbook.opencraft.com/en/latest/invalid loads a broken page.
Expected behavior: The URL https://handbook.opencraft.com/en/latest/invalid should load a 404 page, informing that the URL is invalid.