Have a static <title> on /home regardless of ikiwiki meta title

The idea behind having a /home page for people inside Tails is to be able to adapt it when we want to outreach about the donation campaign, possible survey, onboarding process, etc. But changing [[!meta title breaks the test suite which relies on an image of the title bar. See #12134-note_7. Before changing this again, possibly for the 2017 donation campaign we could make it possible to display a different title in the page and in the title bar.

Feature Branch: web/12156-constant-title-on-home

Parent Task: #14877 (closed)

Original created by @sajolida on 12156 (Redmine)