See #6793ℹ️ This PR adds a `pageTitleStore` which allows defining the current page title
according to 3 parts: an object, a string, and a count. Each part is optional.
⚡ The page title is **reactive** when function argument is a `Ref`, a `Computed`
or a getter. For example, when updating a VM name, the page title will be
updated in every tabs.
🪄 Each title part is automatically unset when the component that set it is
unmounted.
XCP-ng web servers already serve an HTML file with a #root element. This allows
to use the new version of XO Lite without having to change that HTML file on
XCP-ng hosts.
