make bug tracker links on getinvolved page accessible without login
The bug tracker link to Tor on https://www.torproject.org/getinvolved/volunteer.html.en requires a trac account. It is very unlikely that anyone visiting this page for the first time (like after clicking "Get Involved" on about:tor) is logged in.
This longer link gives the same result without login.
I don't know though if this should be fixed in trac or the website.
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