Page 403 - the page title

[cyberbaloo]

Problematic behavior
The page title must be relevant for screen reader users. It should allow them to immediately understand the content and purpose of the page without having to explore it in its entirety.

Having clear page titles makes navigation and page identification easier and, most importantly, makes the user experience more efficient.

Expected behavior/code
Explain the content of the page in the element `<title>

This applies to all pages. Please don't hesitate to fix this bug!

Steps to Reproduce

1. Open this url : https://docs.numerique.gouv.fr/403/
2. and look at the page title !

Possible Solution
Add the document title or page content, for example here it is: Erreur 403 - Docs

Additional context/Screenshots