Have a dedicated page for the homepage of Tor Browser in Tails

This way we could make it more relevant for people inside Tails, from the top of my head:

Move “Tor check” from /news to this page.
Provide some kind of panel which could be more relevant than /news, for example including pointer to documentation for newcomers.
Push and customize donation campaign; I admit that’s this objective :)

Feature Branch: feature/11725-dedicated-homepage

Original created by @sajolida on 11725 (Redmine)

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