implement new about:tor start page
This ticket is to track implementation of the start page portion of #25695 (moved).
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GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
This ticket is to track implementation of the start page portion of #25695 (moved).