Update doc for Tor Browser 8

Likely some UI changes require doc/screenshots updates.
- In Tor Browser 8.0a10 (#15803 (closed)), “New Identity” and “New Tor Circuit” were moved to the hamburger menu so at least https://tails.boum.org/doc/anonymous_internet/Tor_Browser/ needs an update.

While Tails 3.9~rc1 already displays a big part of these changes, 8.0a10 changes things again so I recommend you use ISO images that have #15803 (closed) (once it’s ready for QA or merged) to work on this.

Feature Branch: doc/15805-tor-browser-8

Related issues

Blocks #15411 (closed)
Blocked by #15803 (closed)

Original created by @intrigeri on 15805 (Redmine)

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