Update screenshots in Tor Browser Manual

Since Tor Browser 8.5.x, the Onion menu moved to the right side. We should update TB-Manual to reflect this. With the new release on October 22th we will need to update a bunch of screenshots in TB Manual:

• two screenshots - https://tb-manual.torproject.org/managing-identities/
• https://tb-manual.torproject.org/transports/ - we don't have obfs3 anymore
• two screenshots - https://tb-manual.torproject.org/managing-identities/
• one screenshot - https://tb-manual.torproject.org/secure-connections/
• one screenshot - https://tb-manual.torproject.org/plugins/