Document Authenticode code signing certificate renewal process

While it is still fresh we should document the process of renewing our Windows code signing certificate.

added GeorgKoppen202006 TorBrowserTeam202006 component::applications/tor browser gitlab-tb-tor-browser-spec owner::gk priority::medium severity::normal status::assigned tbb-sign type::defect labels

Moving my tickets to May.

Trac:
Keywords: GeorgKoppen202004 deleted, GeorgKoppen202005 added

Trac:
Keywords: TorBrowserTeam202004 deleted, TorBrowserTeam202005 added

Moving my tickets.

Trac:
Keywords: GeorgKoppen202005 deleted, GeorgKoppen202006 added

Moving tickets to June.

Trac:
Keywords: TorBrowserTeam202005 deleted, TorBrowserTeam202006 added

Trac:
Keywords: N/A deleted, gitlab-tb-tor-browser-spec added

moved to tpo/applications/tor-browser-spec#33971