Instructions for key upload on Mac
From Neal:
Hey a comment on the SSH Public Key file upload button on the sign up page. I know how to access my ~/.ssh/id_rsa.pub file on the terminal. But when you click “Choose File” and it brings up a file dialog box on the Mac, it does not show hidden folders or files, and provides no obvious option to do so. I googled and after a while found the secret Mac keyboard shortcut of “Command-Shift-.” that makes hidden files (including the .ssh folder) appear. We might want to give OS-specific instructions, or provide a box where you can copy and paste your public key.