Rename commitdesk

• Google Play build without the in-app updater
• Android: clone with libgit2
• Rename GitLab Desktop to CommitDesk, with a new logo
• Logo: point to its home in RIEI-Logos, and render from a copy there
• Logo: the original gear artwork around the commit graph
• update policies
• Privacy policy without source comments; the reuse note moves to the maintainer docs