Update trac identity to match styleguide
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change Tor trac logo to: https://styleguide.torproject.org/static/images/color.svg
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change purple links to # 7D4698
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change green h1 to # 68B030
change Tor trac logo to: https://styleguide.torproject.org/static/images/color.svg
change purple links to # 7D4698
change green h1 to # 68B030