fix broken URLs to About
These URLs need redirect. All of them are footnotes in https://en.wikipedia.org/wiki/Tor_(anonymity_network).
https://www.torproject.org/about/findoc/2013-TorProject-Form990.pdf
https://www.torproject.org/about/corepeople
https://www.torproject.org/about/findoc/2008-TorProject-Form990.pdf
https://www.torproject.org/about/findoc/2007-TorProject-Form990.pdf
https://www.torproject.org/about/findoc/2009-TorProject-Form990andPC.pdf
Edited by Antonela